72643722 has 16 divisors (see below), whose sum is σ = 145474272. Its totient is φ = 24183440.

The previous prime is 72643709. The next prime is 72643733. The reversal of 72643722 is 22734627.

It is a super-2 number, since 2×72643722² = 10554220692026568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2448 + ... + 12299.

It is an arithmetic number, because the mean of its divisors is an integer number (9092142).

Almost surely, 2^72643722 is an apocalyptic number.

72643722 is an abundant number, since it is smaller than the sum of its proper divisors (72830550).

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

72643722 is a wasteful number, since it uses less digits than its factorization.

72643722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15573.

The product of its digits is 28224, while the sum is 33.

The square root of 72643722 is about 8523.1286509122. The cubic root of 72643722 is about 417.2528988274.

The spelling of 72643722 in words is "seventy-two million, six hundred forty-three thousand, seven hundred twenty-two".