73405551980 has 24 divisors (see below), whose sum is σ = 157736583312. Its totient is φ = 28679378112.

The previous prime is 73405551953. The next prime is 73405552007. The reversal of 73405551980 is 8915550437.

It is an interprime number because it is at equal distance from previous prime (73405551953) and next prime (73405552007).

It is a super-2 number, since 2×73405551980² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42676787 + ... + 42678506.

It is an arithmetic number, because the mean of its divisors is an integer number (6572357638).

Almost surely, 2^73405551980 is an apocalyptic number.

It is an amenable number.

73405551980 is an abundant number, since it is smaller than the sum of its proper divisors (84331031332).

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

73405551980 is a wasteful number, since it uses less digits than its factorization.

73405551980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85355345 (or 85355343 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 73405551980 in words is "seventy-three billion, four hundred five million, five hundred fifty-one thousand, nine hundred eighty".