72559751 has 4 divisors (see below), whose sum is σ = 79156104. Its totient is φ = 65963400.

The previous prime is 72559717. The next prime is 72559759. The reversal of 72559751 is 15795527.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72559751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72559699 and 72559708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72559759) 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, 3298160 + ... + 3298181.

It is an arithmetic number, because the mean of its divisors is an integer number (19789026).

Almost surely, 2^72559751 is an apocalyptic number.

72559751 is a deficient number, since it is larger than the sum of its proper divisors (6596353).

72559751 is a wasteful number, since it uses less digits than its factorization.

72559751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596352.

The product of its digits is 110250, while the sum is 41.

The square root of 72559751 is about 8518.2011598694. The cubic root of 72559751 is about 417.0920652365.

The spelling of 72559751 in words is "seventy-two million, five hundred fifty-nine thousand, seven hundred fifty-one".