25740720 has 160 divisors (see below), whose sum is σ = 94011840. Its totient is φ = 6451200.

The previous prime is 25740713. The next prime is 25740727. The reversal of 25740720 is 2704752.

25740720 is a `hidden beast` number, since 257 + 407 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25740713) and next prime (25740727).

It is a super-2 number, since 2×25740720² = 1325169332236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (25740727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36370 + ... + 37070.

It is an arithmetic number, because the mean of its divisors is an integer number (587574).

Almost surely, 2^25740720 is an apocalyptic number.

25740720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25740720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47005920).

25740720 is an abundant number, since it is smaller than the sum of its proper divisors (68271120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25740720 is a wasteful number, since it uses less digits than its factorization.

25740720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 25740720 is about 5073.5313145776. The cubic root of 25740720 is about 295.2615510493.

The spelling of 25740720 in words is "twenty-five million, seven hundred forty thousand, seven hundred twenty".