72215739 has 16 divisors (see below), whose sum is σ = 107117440. Its totient is φ = 48084840.

The previous prime is 72215729. The next prime is 72215753. The reversal of 72215739 is 93751227.

It is not a de Polignac number, because 72215739 - 2⁴ = 72215723 is a prime.

It is a super-2 number, since 2×72215739² = 10430225918632242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72215729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40464 + ... + 42210.

It is an arithmetic number, because the mean of its divisors is an integer number (6694840).

Almost surely, 2^72215739 is an apocalyptic number.

72215739 is a deficient number, since it is larger than the sum of its proper divisors (34901701).

72215739 is a wasteful number, since it uses less digits than its factorization.

72215739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3281 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 72215739 is about 8497.9844080817. The cubic root of 72215739 is about 416.4318643655.

It can be divided in two parts, 722 and 15739, that added together give a palindrome (16461).

The spelling of 72215739 in words is "seventy-two million, two hundred fifteen thousand, seven hundred thirty-nine".