73011731778 has 32 divisors (see below), whose sum is σ = 162265509120. Its totient is φ = 24334661520.

The previous prime is 73011731773. The next prime is 73011731791. The reversal of 73011731778 is 87713711037.

73011731778 is a `hidden beast` number, since 7 + 301 + 173 + 177 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73011731773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480951 + ... + 614277.

It is an arithmetic number, because the mean of its divisors is an integer number (5070797160).

Almost surely, 2^73011731778 is an apocalyptic number.

73011731778 is an abundant number, since it is smaller than the sum of its proper divisors (89253777342).

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

73011731778 is a wasteful number, since it uses less digits than its factorization.

73011731778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143479 (or 143473 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The spelling of 73011731778 in words is "seventy-three billion, eleven million, seven hundred thirty-one thousand, seven hundred seventy-eight".