73445409920 has 64 divisors (see below), whose sum is σ = 175649844600. Its totient is φ = 29366550528.

The previous prime is 73445409883. The next prime is 73445409943. The reversal of 73445409920 is 2990454437.

It can be written as a sum of positive squares in 4 ways, for example, as 41593155136 + 31852254784 = 203944^2 + 178472^2 .

It is a tau number, because it is divible by the number of its divisors (64).

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, 1699622 + ... + 1742298.

Almost surely, 2^73445409920 is an apocalyptic number.

It is an amenable number.

73445409920 is an abundant number, since it is smaller than the sum of its proper divisors (102204434680).

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

73445409920 is a wasteful number, since it uses less digits than its factorization.

73445409920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45385 (or 45373 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 73445409920 in words is "seventy-three billion, four hundred forty-five million, four hundred nine thousand, nine hundred twenty".