73145579440 has 40 divisors (see below), whose sum is σ = 175927735440. Its totient is φ = 28249326336.

The previous prime is 73145579417. The next prime is 73145579473. The reversal of 73145579440 is 4497554137.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×73145579440² (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, 15761814 + ... + 15766453.

It is an arithmetic number, because the mean of its divisors is an integer number (4398193386).

Almost surely, 2^73145579440 is an apocalyptic number.

It is an amenable number.

73145579440 is an abundant number, since it is smaller than the sum of its proper divisors (102782156000).

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

73145579440 is a wasteful number, since it uses less digits than its factorization.

73145579440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31528309 (or 31528303 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 73145579440 in words is "seventy-three billion, one hundred forty-five million, five hundred seventy-nine thousand, four hundred forty".