83820786 has 32 divisors (see below), whose sum is σ = 199922688. Its totient is φ = 22907280.

The previous prime is 83820773. The next prime is 83820811. The reversal of 83820786 is 68702838.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 42420 + ... + 44351.

It is an arithmetic number, because the mean of its divisors is an integer number (6247584).

Almost surely, 2^83820786 is an apocalyptic number.

83820786 is an abundant number, since it is smaller than the sum of its proper divisors (116101902).

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

83820786 is a wasteful number, since it uses less digits than its factorization.

83820786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86806.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 83820786 is about 9155.3692443287. The cubic root of 83820786 is about 437.6402354254.

The spelling of 83820786 in words is "eighty-three million, eight hundred twenty thousand, seven hundred eighty-six".