2639264940 has 72 divisors (see below), whose sum is σ = 8621606448. Its totient is φ = 649664640.

The previous prime is 2639264911. The next prime is 2639264981. The reversal of 2639264940 is 494629362.

2639264940 is a `hidden beast` number, since 2 + 639 + 2 + 6 + 4 + 9 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 561606 + ... + 566285.

It is an arithmetic number, because the mean of its divisors is an integer number (119744534).

Almost surely, 2^2639264940 is an apocalyptic number.

2639264940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2639264940 is an abundant number, since it is smaller than the sum of its proper divisors (5982341508).

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

2639264940 is a wasteful number, since it uses less digits than its factorization.

2639264940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127919 (or 1127914 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 2639264940 is about 51373.7767737588. The cubic root of 2639264940 is about 1381.9563619818.

The spelling of 2639264940 in words is "two billion, six hundred thirty-nine million, two hundred sixty-four thousand, nine hundred forty".