72150681 has 4 divisors (see below), whose sum is σ = 96200912. Its totient is φ = 48100452.

The previous prime is 72150667. The next prime is 72150691. The reversal of 72150681 is 18605127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18605127 = 3 ⋅6201709.

It is not a de Polignac number, because 72150681 - 2¹¹ = 72148633 is a prime.

It is a super-2 number, since 2×72150681² = 10411441537527522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72150641) 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, 12025111 + ... + 12025116.

It is an arithmetic number, because the mean of its divisors is an integer number (24050228).

Almost surely, 2^72150681 is an apocalyptic number.

It is an amenable number.

72150681 is a deficient number, since it is larger than the sum of its proper divisors (24050231).

72150681 is a wasteful number, since it uses less digits than its factorization.

72150681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24050230.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 72150681 is about 8494.1556967129. The cubic root of 72150681 is about 416.3067745336.

The spelling of 72150681 in words is "seventy-two million, one hundred fifty thousand, six hundred eighty-one".