40640810 has 32 divisors (see below), whose sum is σ = 88007040. Its totient is φ = 13200192.

The previous prime is 40640801. The next prime is 40640819. The reversal of 40640810 is 1804604.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40640801) and next prime (40640819).

It is a super-2 number, since 2×40640810² = 3303350874912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40640819) 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, 13949 + ... + 16608.

It is an arithmetic number, because the mean of its divisors is an integer number (2750220).

Almost surely, 2^40640810 is an apocalyptic number.

40640810 is an abundant number, since it is smaller than the sum of its proper divisors (47366230).

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

40640810 is a wasteful number, since it uses less digits than its factorization.

40640810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30590.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 40640810 is about 6375.0145097874. The cubic root of 40640810 is about 343.8118055259.

The spelling of 40640810 in words is "forty million, six hundred forty thousand, eight hundred ten".