72499651 has 4 divisors (see below), whose sum is σ = 82856752. Its totient is φ = 62142552.

The previous prime is 72499631. The next prime is 72499663. The reversal of 72499651 is 15699427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72499651 - 2⁵ = 72499619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72499598 and 72499607.

It is not an unprimeable number, because it can be changed into a prime (72499621) 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, 5178540 + ... + 5178553.

It is an arithmetic number, because the mean of its divisors is an integer number (20714188).

Almost surely, 2^72499651 is an apocalyptic number.

72499651 is a deficient number, since it is larger than the sum of its proper divisors (10357101).

72499651 is a wasteful number, since it uses less digits than its factorization.

72499651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10357100.

The product of its digits is 136080, while the sum is 43.

The square root of 72499651 is about 8514.6726889529. The cubic root of 72499651 is about 416.9768766878.

It can be divided in two parts, 7249 and 9651, that added together give a square (16900 = 130²).

The spelling of 72499651 in words is "seventy-two million, four hundred ninety-nine thousand, six hundred fifty-one".