25711720 has 32 divisors (see below), whose sum is σ = 58021920. Its totient is φ = 10254400.

The previous prime is 25711711. The next prime is 25711729. The reversal of 25711720 is 2711752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25711711) and next prime (25711729).

It is a super-2 number, since 2×25711720² = 1322185090716800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25711729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16995 + ... + 18445.

It is an arithmetic number, because the mean of its divisors is an integer number (1813185).

Almost surely, 2^25711720 is an apocalyptic number.

25711720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25711720 is an abundant number, since it is smaller than the sum of its proper divisors (32310200).

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

25711720 is a wasteful number, since it uses less digits than its factorization.

25711720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905 (or 1901 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 25711720 is about 5070.6725392200. The cubic root of 25711720 is about 295.1506268976.

The spelling of 25711720 in words is "twenty-five million, seven hundred eleven thousand, seven hundred twenty".