83656840 has 16 divisors (see below), whose sum is σ = 188227980. Its totient is φ = 33462720.

The previous prime is 83656799. The next prime is 83656849. The reversal of 83656840 is 4865638.

It can be written as a sum of positive squares in 2 ways, for example, as 70997476 + 12659364 = 8426^2 + 3558^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2091421 = 83656840 / (8 + 3 + 6 + 5 + 6 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 83656793 and 83656802.

It is not an unprimeable number, because it can be changed into a prime (83656849) 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, 1045671 + ... + 1045750.

Almost surely, 2^83656840 is an apocalyptic number.

It is an amenable number.

83656840 is an abundant number, since it is smaller than the sum of its proper divisors (104571140).

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

83656840 is a wasteful number, since it uses less digits than its factorization.

83656840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091432 (or 2091428 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 83656840 is about 9146.4113181072. The cubic root of 83656840 is about 437.3547207425.

The spelling of 83656840 in words is "eighty-three million, six hundred fifty-six thousand, eight hundred forty".