25712780 has 24 divisors (see below), whose sum is σ = 55457808. Its totient is φ = 10006848.

The previous prime is 25712779. The next prime is 25712783. The reversal of 25712780 is 8721752.

It is a super-2 number, since 2×25712780² = 1322294110656800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25712783) 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, 16634 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (2310742).

Almost surely, 2^25712780 is an apocalyptic number.

25712780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25712780 is an abundant number, since it is smaller than the sum of its proper divisors (29745028).

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

25712780 is a wasteful number, since it uses less digits than its factorization.

25712780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34793 (or 34791 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 25712780 is about 5070.7770607669. Note that the first 3 decimals coincide. The cubic root of 25712780 is about 295.1546828348.

The spelling of 25712780 in words is "twenty-five million, seven hundred twelve thousand, seven hundred eighty".