25657440 has 48 divisors (see below), whose sum is σ = 80822448. Its totient is φ = 6841856.

The previous prime is 25657439. The next prime is 25657451. The reversal of 25657440 is 4475652.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

It is a congruent number.

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, 26247 + ... + 27206.

It is an arithmetic number, because the mean of its divisors is an integer number (1683801).

Almost surely, 2^25657440 is an apocalyptic number.

25657440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25657440 is an abundant number, since it is smaller than the sum of its proper divisors (55165008).

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

25657440 is a wasteful number, since it uses less digits than its factorization.

25657440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53471 (or 53463 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 25657440 is about 5065.3173641935. The cubic root of 25657440 is about 294.9427831194.

The spelling of 25657440 in words is "twenty-five million, six hundred fifty-seven thousand, four hundred forty".