73021971636 has 96 divisors (see below), whose sum is σ = 197870668800. Its totient is φ = 23244265440.

The previous prime is 73021971629. The next prime is 73021971677. The reversal of 73021971636 is 63617912037.

73021971636 is a `hidden beast` number, since 7 + 3 + 0 + 2 + 1 + 9 + 7 + 1 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 73021971591 and 73021971600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1513851 + ... + 1561341.

It is an arithmetic number, because the mean of its divisors is an integer number (2061152800).

Almost surely, 2^73021971636 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 73021971636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98935334400).

73021971636 is an abundant number, since it is smaller than the sum of its proper divisors (124848697164).

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

73021971636 is a wasteful number, since it uses less digits than its factorization.

73021971636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48146 (or 48138 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 73021971636 in words is "seventy-three billion, twenty-one million, nine hundred seventy-one thousand, six hundred thirty-six".