83633681 has 4 divisors (see below), whose sum is σ = 87269952. Its totient is φ = 79997412.

The previous prime is 83633647. The next prime is 83633699. The reversal of 83633681 is 18633638.

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 a cyclic number.

It is not a de Polignac number, because 83633681 - 2⁶ = 83633617 is a prime.

It is a super-2 number, since 2×83633681² = 13989185195219522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83633881) 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, 1818101 + ... + 1818146.

It is an arithmetic number, because the mean of its divisors is an integer number (21817488).

Almost surely, 2^83633681 is an apocalyptic number.

It is an amenable number.

83633681 is a deficient number, since it is larger than the sum of its proper divisors (3636271).

83633681 is a wasteful number, since it uses less digits than its factorization.

83633681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636270.

The product of its digits is 62208, while the sum is 38.

The square root of 83633681 is about 9145.1452148121. The cubic root of 83633681 is about 437.3143588993.

The spelling of 83633681 in words is "eighty-three million, six hundred thirty-three thousand, six hundred eighty-one".