83720964 has 12 divisors (see below), whose sum is σ = 195348944. Its totient is φ = 27906984.

The previous prime is 83720963. The next prime is 83720977. The reversal of 83720964 is 46902738.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (83720963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3488362 + ... + 3488385.

Almost surely, 2^83720964 is an apocalyptic number.

It is an amenable number.

83720964 is an abundant number, since it is smaller than the sum of its proper divisors (111627980).

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

83720964 is a wasteful number, since it uses less digits than its factorization.

83720964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6976754 (or 6976752 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 83720964 is about 9149.9160651888. The cubic root of 83720964 is about 437.4664381329.

The spelling of 83720964 in words is "eighty-three million, seven hundred twenty thousand, nine hundred sixty-four".