40720784 has 40 divisors (see below), whose sum is σ = 85645560. Its totient is φ = 18643968.

The previous prime is 40720759. The next prime is 40720817. The reversal of 40720784 is 48702704.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 40704400 = 128^2 + 6380^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40720784.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27782 + ... + 29210.

It is an arithmetic number, because the mean of its divisors is an integer number (2141139).

Almost surely, 2^40720784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40720784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42822780).

40720784 is an abundant number, since it is smaller than the sum of its proper divisors (44924776).

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

40720784 is a wasteful number, since it uses less digits than its factorization.

40720784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1581 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 40720784 is about 6381.2838833576. The cubic root of 40720784 is about 344.0371782425.

The spelling of 40720784 in words is "forty million, seven hundred twenty thousand, seven hundred eighty-four".