83720699 has 12 divisors (see below), whose sum is σ = 91016904. Its totient is φ = 76952064.

The previous prime is 83720687. The next prime is 83720701. The reversal of 83720699 is 99602738.

It is not a de Polignac number, because 83720699 - 2²⁰ = 82672123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83720629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9059 + ... + 15795.

It is an arithmetic number, because the mean of its divisors is an integer number (7584742).

Almost surely, 2^83720699 is an apocalyptic number.

83720699 is a deficient number, since it is larger than the sum of its proper divisors (7296205).

83720699 is a wasteful number, since it uses less digits than its factorization.

83720699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6814 (or 6797 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 83720699 is about 9149.9015841702. The cubic root of 83720699 is about 437.4659765650.

The spelling of 83720699 in words is "eighty-three million, seven hundred twenty thousand, six hundred ninety-nine".