2640455040 has 64 divisors (see below), whose sum is σ = 8416456560. Its totient is φ = 704120832.

The previous prime is 2640455029. The next prime is 2640455107. The reversal of 2640455040 is 405540462.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2640455040² = 13944005636522803200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2640454989 and 2640455007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685699 + ... + 689538.

Almost surely, 2^2640455040 is an apocalyptic number.

2640455040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640455040 is an abundant number, since it is smaller than the sum of its proper divisors (5776001520).

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

2640455040 is a wasteful number, since it uses less digits than its factorization.

2640455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375259 (or 1375247 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 2640455040 is about 51385.3582258604. The cubic root of 2640455040 is about 1382.1640484855.

The spelling of 2640455040 in words is "two billion, six hundred forty million, four hundred fifty-five thousand, forty".