72388831 has 8 divisors (see below), whose sum is σ = 74797344. Its totient is φ = 70019040.

The previous prime is 72388807. The next prime is 72388859. The reversal of 72388831 is 13888327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72388831 is a prime.

It is a super-2 number, since 2×72388831² = 10480285707093122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72388801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5856 + ... + 13381.

It is an arithmetic number, because the mean of its divisors is an integer number (9349668).

Almost surely, 2^72388831 is an apocalyptic number.

72388831 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

72388831 is a deficient number, since it is larger than the sum of its proper divisors (2408513).

72388831 is a wasteful number, since it uses less digits than its factorization.

72388831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19361.

The product of its digits is 64512, while the sum is 40.

The square root of 72388831 is about 8508.1626101057. The cubic root of 72388831 is about 416.7643104137.

The spelling of 72388831 in words is "seventy-two million, three hundred eighty-eight thousand, eight hundred thirty-one".