73021980 has 24 divisors (see below), whose sum is σ = 204461712. Its totient is φ = 19472512.

The previous prime is 73021931. The next prime is 73021981. The reversal of 73021980 is 8912037.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73021981) 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, 608457 + ... + 608576.

It is an arithmetic number, because the mean of its divisors is an integer number (8519238).

Almost surely, 2^73021980 is an apocalyptic number.

It is an amenable number.

73021980 is an abundant number, since it is smaller than the sum of its proper divisors (131439732).

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

73021980 is a wasteful number, since it uses less digits than its factorization.

73021980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217045 (or 1217043 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 73021980 is about 8545.2899307162. The cubic root of 73021980 is about 417.9758614908.

The spelling of 73021980 in words is "seventy-three million, twenty-one thousand, nine hundred eighty".