25640094040 has 32 divisors (see below), whose sum is σ = 62934777360. Its totient is φ = 9323670400.

The previous prime is 25640094023. The next prime is 25640094043. The reversal of 25640094040 is 4049004652.

It is a junction number, because it is equal to n+sod(n) for n = 25640093987 and 25640094005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640094043) 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, 29136031 + ... + 29136910.

Almost surely, 2^25640094040 is an apocalyptic number.

25640094040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25640094040 is an abundant number, since it is smaller than the sum of its proper divisors (37294683320).

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

25640094040 is a wasteful number, since it uses less digits than its factorization.

25640094040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58272963 (or 58272959 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 25640094040 its reverse (4049004652), we get a palindrome (29689098692).

The spelling of 25640094040 in words is "twenty-five billion, six hundred forty million, ninety-four thousand, forty".