72121598 has 4 divisors (see below), whose sum is σ = 108182400. Its totient is φ = 36060798.

The previous prime is 72121589. The next prime is 72121603. The reversal of 72121598 is 89512127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89512127 = 911 ⋅98257.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18030398 + ... + 18030401.

It is an arithmetic number, because the mean of its divisors is an integer number (27045600).

Almost surely, 2^72121598 is an apocalyptic number.

72121598 is a deficient number, since it is larger than the sum of its proper divisors (36060802).

72121598 is a wasteful number, since it uses less digits than its factorization.

72121598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36060801.

The product of its digits is 10080, while the sum is 35.

The square root of 72121598 is about 8492.4435823855. The cubic root of 72121598 is about 416.2508310697.

The spelling of 72121598 in words is "seventy-two million, one hundred twenty-one thousand, five hundred ninety-eight".