72770020 has 24 divisors (see below), whose sum is σ = 157747968. Its totient is φ = 28168800.

The previous prime is 72769997. The next prime is 72770021. The reversal of 72770020 is 2007727.

It is not an unprimeable number, because it can be changed into a prime (72770021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58066 + ... + 59305.

It is an arithmetic number, because the mean of its divisors is an integer number (6572832).

Almost surely, 2^72770020 is an apocalyptic number.

It is an amenable number.

72770020 is an abundant number, since it is smaller than the sum of its proper divisors (84977948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72770020 is a wasteful number, since it uses less digits than its factorization.

72770020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117411 (or 117409 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 25.

The square root of 72770020 is about 8530.5345670714. The cubic root of 72770020 is about 417.4945700705.

Adding to 72770020 its reverse (2007727), we get a palindrome (74777747).

The spelling of 72770020 in words is "seventy-two million, seven hundred seventy thousand, twenty".