40640635 has 32 divisors (see below), whose sum is σ = 57802752. Its totient is φ = 26853120.

The previous prime is 40640623. The next prime is 40640647. The reversal of 40640635 is 53604604.

It is an interprime number because it is at equal distance from previous prime (40640623) and next prime (40640647).

It is not a de Polignac number, because 40640635 - 2⁵ = 40640603 is a prime.

It is a super-2 number, since 2×40640635² = 3303322426406450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182134 + ... + 182356.

It is an arithmetic number, because the mean of its divisors is an integer number (1806336).

Almost surely, 2^40640635 is an apocalyptic number.

40640635 is a deficient number, since it is larger than the sum of its proper divisors (17162117).

40640635 is a wasteful number, since it uses less digits than its factorization.

40640635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 40640635 is about 6375.0007843137. Note that the first 3 decimals coincide. The cubic root of 40640635 is about 343.8113120388.

It can be divided in two parts, 40640 and 635, that multiplied together give a square (25806400 = 5080²).

The spelling of 40640635 in words is "forty million, six hundred forty thousand, six hundred thirty-five".