39640680 has 96 divisors (see below), whose sum is σ = 133309800. Its totient is φ = 10203648.

The previous prime is 39640673. The next prime is 39640691. The reversal of 39640680 is 8604693.

39640680 is a `hidden beast` number, since 3 + 9 + 640 + 6 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19766916 + 19873764 = 4446^2 + 4458^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 8542 + ... + 12338.

Almost surely, 2^39640680 is an apocalyptic number.

39640680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39640680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66654900).

39640680 is an abundant number, since it is smaller than the sum of its proper divisors (93669120).

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

39640680 is a wasteful number, since it uses less digits than its factorization.

39640680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843 (or 3836 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 39640680 is about 6296.0844975270. The cubic root of 39640680 is about 340.9680600052.

The spelling of 39640680 in words is "thirty-nine million, six hundred forty thousand, six hundred eighty".