72691839 has 18 divisors (see below), whose sum is σ = 115414208. Its totient is φ = 44055000.

The previous prime is 72691837. The next prime is 72691849. The reversal of 72691839 is 93819627.

It is not a de Polignac number, because 72691839 - 2¹ = 72691837 is a prime.

It is a super-3 number, since 3×72691839³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72691794 and 72691803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72691837) 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, 32287 + ... + 34464.

Almost surely, 2^72691839 is an apocalyptic number.

72691839 is a deficient number, since it is larger than the sum of its proper divisors (42722369).

72691839 is a wasteful number, since it uses less digits than its factorization.

72691839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66779 (or 66765 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 72691839 is about 8525.9509147074. The cubic root of 72691839 is about 417.3450037197.

The spelling of 72691839 in words is "seventy-two million, six hundred ninety-one thousand, eight hundred thirty-nine".