2501262640 has 20 divisors (see below), whose sum is σ = 5815435824. Its totient is φ = 1000505024.

The previous prime is 2501262623. The next prime is 2501262671. The reversal of 2501262640 is 462621052.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 2501262599 and 2501262608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15632812 + ... + 15632971.

Almost surely, 2^2501262640 is an apocalyptic number.

2501262640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2501262640 is an abundant number, since it is smaller than the sum of its proper divisors (3314173184).

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

2501262640 is a wasteful number, since it uses less digits than its factorization.

2501262640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31265796 (or 31265790 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 2501262640 is about 50012.6248061427. The cubic root of 2501262640 is about 1357.4372586590.

Adding to 2501262640 its reverse (462621052), we get a palindrome (2963883692).

The spelling of 2501262640 in words is "two billion, five hundred one million, two hundred sixty-two thousand, six hundred forty".