72537248437 has 4 divisors (see below), whose sum is σ = 73905875820. Its totient is φ = 71168621056.

The previous prime is 72537248429. The next prime is 72537248447. The reversal of 72537248437 is 73484273527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73484273527 = 7 ⋅10497753361.

It can be written as a sum of positive squares in 2 ways, for example, as 26111651281 + 46425597156 = 161591^2 + 215466^2 .

It is a cyclic number.

It is not a de Polignac number, because 72537248437 - 2³ = 72537248429 is a prime.

It is a super-2 number, since 2×72537248437² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72537248447) 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, 684313612 + ... + 684313717.

It is an arithmetic number, because the mean of its divisors is an integer number (18476468955).

Almost surely, 2^72537248437 is an apocalyptic number.

It is an amenable number.

72537248437 is a deficient number, since it is larger than the sum of its proper divisors (1368627383).

72537248437 is a wasteful number, since it uses less digits than its factorization.

72537248437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368627382.

The product of its digits is 7902720, while the sum is 52.

The spelling of 72537248437 in words is "seventy-two billion, five hundred thirty-seven million, two hundred forty-eight thousand, four hundred thirty-seven".