72388386 has 36 divisors (see below), whose sum is σ = 182450502. Its totient is φ = 20682144.

The previous prime is 72388361. The next prime is 72388387. The reversal of 72388386 is 68388327.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 53361 = 8505^2 + 231^2 .

It is not an unprimeable number, because it can be changed into a prime (72388387) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40155 + ... + 41918.

Almost surely, 2^72388386 is an apocalyptic number.

72388386 is an abundant number, since it is smaller than the sum of its proper divisors (110062116).

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

72388386 is a wasteful number, since it uses less digits than its factorization.

72388386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82095 (or 82085 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 72388386 is about 8508.1364587082. The cubic root of 72388386 is about 416.7634564122.

The spelling of 72388386 in words is "seventy-two million, three hundred eighty-eight thousand, three hundred eighty-six".