83620979 has 4 divisors (see below), whose sum is σ = 90053376. Its totient is φ = 77188584.

The previous prime is 83620973. The next prime is 83620987. The reversal of 83620979 is 97902638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97902638 = 2 ⋅48951319.

It is a cyclic number.

It is not a de Polignac number, because 83620979 - 2⁸ = 83620723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83620973) 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, 3216179 + ... + 3216204.

It is an arithmetic number, because the mean of its divisors is an integer number (22513344).

Almost surely, 2^83620979 is an apocalyptic number.

83620979 is a deficient number, since it is larger than the sum of its proper divisors (6432397).

83620979 is a wasteful number, since it uses less digits than its factorization.

83620979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432396.

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

The square root of 83620979 is about 9144.4507216125. The cubic root of 83620979 is about 437.2922185042.

The spelling of 83620979 in words is "eighty-three million, six hundred twenty thousand, nine hundred seventy-nine".