72138701 has 4 divisors (see below), whose sum is σ = 76382172. Its totient is φ = 67895232.

The previous prime is 72138659. The next prime is 72138713. The reversal of 72138701 is 10783127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10783127 = 19 ⋅567533.

It can be written as a sum of positive squares in 2 ways, for example, as 39363076 + 32775625 = 6274^2 + 5725^2 .

It is a cyclic number.

It is not a de Polignac number, because 72138701 - 2²⁶ = 5029837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72138761) 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, 2121710 + ... + 2121743.

It is an arithmetic number, because the mean of its divisors is an integer number (19095543).

Almost surely, 2^72138701 is an apocalyptic number.

It is an amenable number.

72138701 is a deficient number, since it is larger than the sum of its proper divisors (4243471).

72138701 is a wasteful number, since it uses less digits than its factorization.

72138701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243470.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 72138701 is about 8493.4504766908. The cubic root of 72138701 is about 416.2837318719.

The spelling of 72138701 in words is "seventy-two million, one hundred thirty-eight thousand, seven hundred one".