73157640 has 64 divisors (see below), whose sum is σ = 223214400. Its totient is φ = 19176192.

The previous prime is 73157629. The next prime is 73157671. The reversal of 73157640 is 4675137.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (3487725).

Almost surely, 2^73157640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73157640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111607200).

73157640 is an abundant number, since it is smaller than the sum of its proper divisors (150056760).

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

73157640 is a wasteful number, since it uses less digits than its factorization.

73157640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10406 (or 10402 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 73157640 is about 8553.2239535745. The cubic root of 73157640 is about 418.2345394377.

The spelling of 73157640 in words is "seventy-three million, one hundred fifty-seven thousand, six hundred forty".