25401640 has 32 divisors (see below), whose sum is σ = 62350560. Its totient is φ = 9236800.

The previous prime is 25401631. The next prime is 25401653. The reversal of 25401640 is 4610452.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28426 + ... + 29305.

It is an arithmetic number, because the mean of its divisors is an integer number (1948455).

Almost surely, 2^25401640 is an apocalyptic number.

25401640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25401640 is an abundant number, since it is smaller than the sum of its proper divisors (36948920).

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

25401640 is a wasteful number, since it uses less digits than its factorization.

25401640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57753 (or 57749 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 25401640 is about 5040.0039682524. The cubic root of 25401640 is about 293.9593323051.

The spelling of 25401640 in words is "twenty-five million, four hundred one thousand, six hundred forty".