72378739 has 4 divisors (see below), whose sum is σ = 73250856. Its totient is φ = 71506624.

The previous prime is 72378737. The next prime is 72378743. The reversal of 72378739 is 93787327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72378739 - 2¹ = 72378737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72378737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435934 + ... + 436099.

It is an arithmetic number, because the mean of its divisors is an integer number (18312714).

Almost surely, 2^72378739 is an apocalyptic number.

72378739 is a deficient number, since it is larger than the sum of its proper divisors (872117).

72378739 is an equidigital number, since it uses as much as digits as its factorization.

72378739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872116.

The product of its digits is 444528, while the sum is 46.

The square root of 72378739 is about 8507.5695119111. The cubic root of 72378739 is about 416.7449419520.

The spelling of 72378739 in words is "seventy-two million, three hundred seventy-eight thousand, seven hundred thirty-nine".