72859637 has 4 divisors (see below), whose sum is σ = 77145516. Its totient is φ = 68573760.

The previous prime is 72859613. The next prime is 72859639. The reversal of 72859637 is 73695827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73695827 = 89 ⋅828043.

It can be written as a sum of positive squares in 2 ways, for example, as 68046001 + 4813636 = 8249^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 72859637 - 2⁶ = 72859573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72859591 and 72859600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72859639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142914 + ... + 2142947.

It is an arithmetic number, because the mean of its divisors is an integer number (19286379).

Almost surely, 2^72859637 is an apocalyptic number.

It is an amenable number.

72859637 is a deficient number, since it is larger than the sum of its proper divisors (4285879).

72859637 is a wasteful number, since it uses less digits than its factorization.

72859637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285878.

The product of its digits is 635040, while the sum is 47.

The square root of 72859637 is about 8535.7856697553. The cubic root of 72859637 is about 417.6658826640.

The spelling of 72859637 in words is "seventy-two million, eight hundred fifty-nine thousand, six hundred thirty-seven".