25640464 has 10 divisors (see below), whose sum is σ = 49678430. Its totient is φ = 12820224.

The previous prime is 25640453. The next prime is 25640467. The reversal of 25640464 is 46404652.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 36864 = 5060^2 + 192^2 .

It is not an unprimeable number, because it can be changed into a prime (25640467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801249 + ... + 801280.

It is an arithmetic number, because the mean of its divisors is an integer number (4967843).

Almost surely, 2^25640464 is an apocalyptic number.

It is an amenable number.

25640464 is a deficient number, since it is larger than the sum of its proper divisors (24037966).

25640464 is a wasteful number, since it uses less digits than its factorization.

25640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602537 (or 1602531 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 25640464 is about 5063.6413775069. The cubic root of 25640464 is about 294.8777200765.

The spelling of 25640464 in words is "twenty-five million, six hundred forty thousand, four hundred sixty-four".