72028649691 has 24 divisors (see below), whose sum is σ = 105642823104. Its totient is φ = 47280633840.

The previous prime is 72028649687. The next prime is 72028649701. The reversal of 72028649691 is 19694682027.

72028649691 is a `hidden beast` number, since 72 + 0 + 2 + 86 + 496 + 9 + 1 = 666.

It is not a de Polignac number, because 72028649691 - 2² = 72028649687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72028649191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1340656 + ... + 1393346.

It is an arithmetic number, because the mean of its divisors is an integer number (4401784296).

Almost surely, 2^72028649691 is an apocalyptic number.

72028649691 is a deficient number, since it is larger than the sum of its proper divisors (33614173413).

72028649691 is a wasteful number, since it uses less digits than its factorization.

72028649691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55031 (or 55028 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 72028649691 in words is "seventy-two billion, twenty-eight million, six hundred forty-nine thousand, six hundred ninety-one".