8721267940 has 72 divisors (see below), whose sum is σ = 23241641472. Its totient is φ = 2718313920.

The previous prime is 8721267931. The next prime is 8721267943. The reversal of 8721267940 is 497621278.

It is not an unprimeable number, because it can be changed into a prime (8721267943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393732 + ... + 415291.

It is an arithmetic number, because the mean of its divisors is an integer number (322800576).

Almost surely, 2^8721267940 is an apocalyptic number.

It is an amenable number.

8721267940 is an abundant number, since it is smaller than the sum of its proper divisors (14520373532).

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

8721267940 is a wasteful number, since it uses less digits than its factorization.

8721267940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809057 (or 809048 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 8721267940 is about 93387.7290654399. The cubic root of 8721267940 is about 2058.3846906092.

The spelling of 8721267940 in words is "eight billion, seven hundred twenty-one million, two hundred sixty-seven thousand, nine hundred forty".