72231678 has 12 divisors (see below), whose sum is σ = 156502008. Its totient is φ = 24077220.

The previous prime is 72231641. The next prime is 72231683. The reversal of 72231678 is 87613227.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2006418 + ... + 2006453.

It is an arithmetic number, because the mean of its divisors is an integer number (13041834).

Almost surely, 2^72231678 is an apocalyptic number.

72231678 is an abundant number, since it is smaller than the sum of its proper divisors (84270330).

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

72231678 is a wasteful number, since it uses less digits than its factorization.

72231678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012879 (or 4012876 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 72231678 is about 8498.9221669574. The cubic root of 72231678 is about 416.4624995120.

It can be divided in two parts, 722 and 31678, that added together give a square (32400 = 180²).

The spelling of 72231678 in words is "seventy-two million, two hundred thirty-one thousand, six hundred seventy-eight".