25640934 has 16 divisors (see below), whose sum is σ = 55944000. Its totient is φ = 7769960.

The previous prime is 25640933. The next prime is 25640939. The reversal of 25640934 is 43904652.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 25640895 and 25640904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640933) 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, 194184 + ... + 194315.

It is an arithmetic number, because the mean of its divisors is an integer number (3496500).

Almost surely, 2^25640934 is an apocalyptic number.

25640934 is an abundant number, since it is smaller than the sum of its proper divisors (30303066).

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

25640934 is a wasteful number, since it uses less digits than its factorization.

25640934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388515.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 25640934 is about 5063.6877865840. The cubic root of 25640934 is about 294.8795218078.

The spelling of 25640934 in words is "twenty-five million, six hundred forty thousand, nine hundred thirty-four".