72078040 has 32 divisors (see below), whose sum is σ = 162571680. Its totient is φ = 28760832.

The previous prime is 72078031. The next prime is 72078047. The reversal of 72078040 is 4087027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72078047) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16309 + ... + 20251.

It is an arithmetic number, because the mean of its divisors is an integer number (5080365).

Almost surely, 2^72078040 is an apocalyptic number.

It is an amenable number.

72078040 is an abundant number, since it is smaller than the sum of its proper divisors (90493640).

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

72078040 is a wasteful number, since it uses less digits than its factorization.

72078040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411 (or 4407 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 72078040 is about 8489.8786799341. The cubic root of 72078040 is about 416.1670156546.

The spelling of 72078040 in words is "seventy-two million, seventy-eight thousand, forty".