83645864 has 8 divisors (see below), whose sum is σ = 156836010. Its totient is φ = 41822928.

The previous prime is 83645857. The next prime is 83645867. The reversal of 83645864 is 46854638.

It can be written as a sum of positive squares in only one way, i.e., 57123364 + 26522500 = 7558^2 + 5150^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (83645867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5227859 + ... + 5227874.

Almost surely, 2^83645864 is an apocalyptic number.

It is an amenable number.

83645864 is a deficient number, since it is larger than the sum of its proper divisors (73190146).

83645864 is a wasteful number, since it uses less digits than its factorization.

83645864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10455739 (or 10455735 counting only the distinct ones).

The product of its digits is 552960, while the sum is 44.

The square root of 83645864 is about 9145.8112816743. The cubic root of 83645864 is about 437.3355925382.

The spelling of 83645864 in words is "eighty-three million, six hundred forty-five thousand, eight hundred sixty-four".