40640790 has 32 divisors (see below), whose sum is σ = 98148096. Its totient is φ = 10769760.

The previous prime is 40640773. The next prime is 40640797. The reversal of 40640790 is 9704604.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640797) 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, 735 + ... + 9045.

It is an arithmetic number, because the mean of its divisors is an integer number (3067128).

Almost surely, 2^40640790 is an apocalyptic number.

40640790 is an abundant number, since it is smaller than the sum of its proper divisors (57507306).

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

40640790 is a wasteful number, since it uses less digits than its factorization.

40640790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 40640790 is about 6375.0129411633. The cubic root of 40640790 is about 343.8117491275.

The spelling of 40640790 in words is "forty million, six hundred forty thousand, seven hundred ninety".