72439785 has 32 divisors (see below), whose sum is σ = 140492160. Its totient is φ = 35121600.

The previous prime is 72439769. The next prime is 72439823. The reversal of 72439785 is 58793427.

It is not a de Polignac number, because 72439785 - 2⁴ = 72439769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 72439785.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22906 + ... + 25875.

It is an arithmetic number, because the mean of its divisors is an integer number (4390380).

Almost surely, 2^72439785 is an apocalyptic number.

It is an amenable number.

72439785 is a deficient number, since it is larger than the sum of its proper divisors (68052375).

72439785 is a wasteful number, since it uses less digits than its factorization.

72439785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48806 (or 48800 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 72439785 is about 8511.1565019097. The cubic root of 72439785 is about 416.8620733224.

The spelling of 72439785 in words is "seventy-two million, four hundred thirty-nine thousand, seven hundred eighty-five".