25646340 has 24 divisors (see below), whose sum is σ = 71809920. Its totient is φ = 6839008.

The previous prime is 25646321. The next prime is 25646347. The reversal of 25646340 is 4364652.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25646298 and 25646307.

It is not an unprimeable number, because it can be changed into a prime (25646347) 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, 213660 + ... + 213779.

It is an arithmetic number, because the mean of its divisors is an integer number (2992080).

Almost surely, 2^25646340 is an apocalyptic number.

25646340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25646340 is an abundant number, since it is smaller than the sum of its proper divisors (46163580).

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

25646340 is a wasteful number, since it uses less digits than its factorization.

25646340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427451 (or 427449 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 25646340 is about 5064.2215591342. The cubic root of 25646340 is about 294.9002439687.

The spelling of 25646340 in words is "twenty-five million, six hundred forty-six thousand, three hundred forty".