72912020 has 24 divisors (see below), whose sum is σ = 153535200. Its totient is φ = 29084832.

The previous prime is 72911999. The next prime is 72912029. The reversal of 72912020 is 2021927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72912029) 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, 2771 + ... + 12389.

It is an arithmetic number, because the mean of its divisors is an integer number (6397300).

Almost surely, 2^72912020 is an apocalyptic number.

It is an amenable number.

72912020 is an abundant number, since it is smaller than the sum of its proper divisors (80623180).

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

72912020 is a wasteful number, since it uses less digits than its factorization.

72912020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007 (or 10005 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 72912020 is about 8538.8535530246. The cubic root of 72912020 is about 417.7659533921.

Adding to 72912020 its reverse (2021927), we get a palindrome (74933947).

The spelling of 72912020 in words is "seventy-two million, nine hundred twelve thousand, twenty".