83213815 has 16 divisors (see below), whose sum is σ = 102564000. Its totient is φ = 64778112.

The previous prime is 83213807. The next prime is 83213833. The reversal of 83213815 is 51831238.

It is a cyclic number.

It is not a de Polignac number, because 83213815 - 2³ = 83213807 is a prime.

It is a super-3 number, since 3×83213815³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74481 + ... + 75589.

It is an arithmetic number, because the mean of its divisors is an integer number (6410250).

Almost surely, 2^83213815 is an apocalyptic number.

83213815 is a deficient number, since it is larger than the sum of its proper divisors (19350185).

83213815 is a wasteful number, since it uses less digits than its factorization.

83213815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

The product of its digits is 5760, while the sum is 31.

The square root of 83213815 is about 9122.1606541433. The cubic root of 83213815 is about 436.5813146960.

The spelling of 83213815 in words is "eighty-three million, two hundred thirteen thousand, eight hundred fifteen".