72391868 has 12 divisors (see below), whose sum is σ = 127807680. Its totient is φ = 35875392.

The previous prime is 72391867. The next prime is 72391871. The reversal of 72391868 is 86819327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72391861) 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, 79628 + ... + 80531.

It is an arithmetic number, because the mean of its divisors is an integer number (10650640).

Almost surely, 2^72391868 is an apocalyptic number.

It is an amenable number.

72391868 is a deficient number, since it is larger than the sum of its proper divisors (55415812).

72391868 is a wasteful number, since it uses less digits than its factorization.

72391868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160276 (or 160274 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 72391868 is about 8508.3410839011. The cubic root of 72391868 is about 416.7701386402.

The spelling of 72391868 in words is "seventy-two million, three hundred ninety-one thousand, eight hundred sixty-eight".