72980894637 has 36 divisors (see below), whose sum is σ = 122832247356. Its totient is φ = 41633827200.

The previous prime is 72980894611. The next prime is 72980894641. The reversal of 72980894637 is 73649808927.

72980894637 is a `hidden beast` number, since 7 + 2 + 98 + 0 + 89 + 463 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57806104041 + 15174790596 = 240429^2 + 123186^2 .

It is not a de Polignac number, because 72980894637 - 2¹⁶ = 72980829101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72980894537) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 127363 + ... + 402719.

It is an arithmetic number, because the mean of its divisors is an integer number (3412006871).

Almost surely, 2^72980894637 is an apocalyptic number.

It is an amenable number.

72980894637 is a deficient number, since it is larger than the sum of its proper divisors (49851352719).

72980894637 is a wasteful number, since it uses less digits than its factorization.

72980894637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275978 (or 275968 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 72980894637 in words is "seventy-two billion, nine hundred eighty million, eight hundred ninety-four thousand, six hundred thirty-seven".