72420723 has 20 divisors (see below), whose sum is σ = 113880360. Its totient is φ = 45738432.

The previous prime is 72420713. The next prime is 72420791. The reversal of 72420723 is 32702427.

It is not a de Polignac number, because 72420723 - 2⁴ = 72420707 is a prime.

It is a super-2 number, since 2×72420723² = 10489522239685458, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (72420713) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21990 + ... + 25067.

It is an arithmetic number, because the mean of its divisors is an integer number (5694018).

Almost surely, 2^72420723 is an apocalyptic number.

72420723 is a deficient number, since it is larger than the sum of its proper divisors (41459637).

72420723 is a wasteful number, since it uses less digits than its factorization.

72420723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47088 (or 47079 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 72420723 is about 8510.0366039166. The cubic root of 72420723 is about 416.8255053787.

The spelling of 72420723 in words is "seventy-two million, four hundred twenty thousand, seven hundred twenty-three".