40780728 has 48 divisors (see below), whose sum is σ = 114262200. Its totient is φ = 13124160.

The previous prime is 40780709. The next prime is 40780759. The reversal of 40780728 is 82708704.

40780728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 40780692 and 40780701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7678 + ... + 11853.

Almost surely, 2^40780728 is an apocalyptic number.

It is an amenable number.

40780728 is an abundant number, since it is smaller than the sum of its proper divisors (73481472).

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

40780728 is a wasteful number, since it uses less digits than its factorization.

40780728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19572 (or 19565 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 40780728 is about 6385.9790165643. The cubic root of 40780728 is about 344.2059115145.

The spelling of 40780728 in words is "forty million, seven hundred eighty thousand, seven hundred twenty-eight".