40640620 has 24 divisors (see below), whose sum is σ = 89838000. Its totient is φ = 15400512.

The previous prime is 40640617. The next prime is 40640623. The reversal of 40640620 is 2604604.

It is an interprime number because it is at equal distance from previous prime (40640617) and next prime (40640623).

It is a junction number, because it is equal to n+sod(n) for n = 40640591 and 40640600.

It is not an unprimeable number, because it can be changed into a prime (40640623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53095 + ... + 53854.

It is an arithmetic number, because the mean of its divisors is an integer number (3743250).

Almost surely, 2^40640620 is an apocalyptic number.

It is an amenable number.

40640620 is an abundant number, since it is smaller than the sum of its proper divisors (49197380).

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

40640620 is a wasteful number, since it uses less digits than its factorization.

40640620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106977 (or 106975 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 40640620 is about 6374.9996078431. Note that the first 3 decimals coincide. The cubic root of 40640620 is about 343.8112697398.

The spelling of 40640620 in words is "forty million, six hundred forty thousand, six hundred twenty".