73368512640 has 512 divisors, whose sum is σ = 267588921600. Its totient is φ = 18988204032.

The previous prime is 73368512621. The next prime is 73368512641. The reversal of 73368512640 is 4621586337.

73368512640 is a `hidden beast` number, since 7 + 33 + 68 + 512 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (73368512641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 217710552 + ... + 217710888.

Almost surely, 2^73368512640 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 73368512640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133794460800).

73368512640 is an abundant number, since it is smaller than the sum of its proper divisors (194220408960).

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

73368512640 is a wasteful number, since it uses less digits than its factorization.

73368512640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 73368512640 in words is "seventy-three billion, three hundred sixty-eight million, five hundred twelve thousand, six hundred forty".