72770421 has 16 divisors (see below), whose sum is σ = 103270464. Its totient is φ = 45421824.

The previous prime is 72770407. The next prime is 72770447. The reversal of 72770421 is 12407727.

It is not a de Polignac number, because 72770421 - 2⁵ = 72770389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72770461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6426 + ... + 13668.

It is an arithmetic number, because the mean of its divisors is an integer number (6454404).

Almost surely, 2^72770421 is an apocalyptic number.

It is an amenable number.

72770421 is a deficient number, since it is larger than the sum of its proper divisors (30500043).

72770421 is a wasteful number, since it uses less digits than its factorization.

72770421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 72770421 is about 8530.5580708416. The cubic root of 72770421 is about 417.4953369386.

The spelling of 72770421 in words is "seventy-two million, seven hundred seventy thousand, four hundred twenty-one".