25531720 has 32 divisors (see below), whose sum is σ = 57697920. Its totient is φ = 10168000.

The previous prime is 25531717. The next prime is 25531729. The reversal of 25531720 is 2713552.

It is a super-3 number, since 3×25531720³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25531729) 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, 8769 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (1803060).

Almost surely, 2^25531720 is an apocalyptic number.

25531720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25531720 is an abundant number, since it is smaller than the sum of its proper divisors (32166200).

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

25531720 is a wasteful number, since it uses less digits than its factorization.

25531720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25531720 is about 5052.8922410833. The cubic root of 25531720 is about 294.4602598469.

The spelling of 25531720 in words is "twenty-five million, five hundred thirty-one thousand, seven hundred twenty".