72687497 has 4 divisors (see below), whose sum is σ = 72777936. Its totient is φ = 72597060.

The previous prime is 72687493. The next prime is 72687541. The reversal of 72687497 is 79478627.

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: 79478627 = 37 ⋅2148071.

It is a cyclic number.

It is not a de Polignac number, because 72687497 - 2² = 72687493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72687493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44003 + ... + 45624.

It is an arithmetic number, because the mean of its divisors is an integer number (18194484).

Almost surely, 2^72687497 is an apocalyptic number.

It is an amenable number.

72687497 is a deficient number, since it is larger than the sum of its proper divisors (90439).

72687497 is an equidigital number, since it uses as much as digits as its factorization.

72687497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90438.

The product of its digits is 1185408, while the sum is 50.

The square root of 72687497 is about 8525.6962765513. The cubic root of 72687497 is about 417.3366939924.

The spelling of 72687497 in words is "seventy-two million, six hundred eighty-seven thousand, four hundred ninety-seven".