81872798970 has 64 divisors (see below), whose sum is σ = 197003925504. Its totient is φ = 21776247360.

The previous prime is 81872798951. The next prime is 81872798989. The reversal of 81872798970 is 7989727818.

It is an interprime number because it is at equal distance from previous prime (81872798951) and next prime (81872798989).

It is a super-2 number, since 2×81872798970² (a number of 23 digits) contains 22 as substring.

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, 29207589 + ... + 29210391.

It is an arithmetic number, because the mean of its divisors is an integer number (3078186336).

Almost surely, 2^81872798970 is an apocalyptic number.

81872798970 is an abundant number, since it is smaller than the sum of its proper divisors (115131126534).

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

81872798970 is a wasteful number, since it uses less digits than its factorization.

81872798970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987.

The product of its (nonzero) digits is 28449792, while the sum is 66.

The spelling of 81872798970 in words is "eighty-one billion, eight hundred seventy-two million, seven hundred ninety-eight thousand, nine hundred seventy".