2501402640 has 80 divisors (see below), whose sum is σ = 8459297856. Its totient is φ = 606400000.

The previous prime is 2501402639. The next prime is 2501402641. The reversal of 2501402640 is 462041052.

It is an interprime number because it is at equal distance from previous prime (2501402639) and next prime (2501402641).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2501402640.

It is not an unprimeable number, because it can be changed into a prime (2501402641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471111 + ... + 476390.

Almost surely, 2^2501402640 is an apocalyptic number.

2501402640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2501402640 is an abundant number, since it is smaller than the sum of its proper divisors (5957895216).

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

2501402640 is a wasteful number, since it uses less digits than its factorization.

2501402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947528 (or 947522 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 2501402640 is about 50014.0244331527. The cubic root of 2501402640 is about 1357.4625842242.

Adding to 2501402640 its reverse (462041052), we get a palindrome (2963443692).

The spelling of 2501402640 in words is "two billion, five hundred one million, four hundred two thousand, six hundred forty".