83657649 has 4 divisors (see below), whose sum is σ = 111543536. Its totient is φ = 55771764.

The previous prime is 83657641. The next prime is 83657659. The reversal of 83657649 is 94675638.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 83657649 - 2³ = 83657641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 83657598 and 83657607.

It is not an unprimeable number, because it can be changed into a prime (83657641) 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, 13942939 + ... + 13942944.

It is an arithmetic number, because the mean of its divisors is an integer number (27885884).

Almost surely, 2^83657649 is an apocalyptic number.

It is an amenable number.

83657649 is a deficient number, since it is larger than the sum of its proper divisors (27885887).

83657649 is a wasteful number, since it uses less digits than its factorization.

83657649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27885886.

The product of its digits is 1088640, while the sum is 48.

The square root of 83657649 is about 9146.4555429959. The cubic root of 83657649 is about 437.3561305449.

It can be divided in two parts, 836 and 57649, that added together give a palindrome (58485).

The spelling of 83657649 in words is "eighty-three million, six hundred fifty-seven thousand, six hundred forty-nine".