83945069 has 4 divisors (see below), whose sum is σ = 90402396. Its totient is φ = 77487744.

The previous prime is 83945063. The next prime is 83945077. The reversal of 83945069 is 96054938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10156969 + 73788100 = 3187^2 + 8590^2 .

It is a cyclic number.

It is not a de Polignac number, because 83945069 - 2²⁰ = 82896493 is a prime.

It is a super-2 number, since 2×83945069² = 14093549218829522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83945063) 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, 3228644 + ... + 3228669.

It is an arithmetic number, because the mean of its divisors is an integer number (22600599).

Almost surely, 2^83945069 is an apocalyptic number.

It is an amenable number.

83945069 is a deficient number, since it is larger than the sum of its proper divisors (6457327).

83945069 is a wasteful number, since it uses less digits than its factorization.

83945069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457326.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 83945069 is about 9162.1541680982. The cubic root of 83945069 is about 437.8564283441.

The spelling of 83945069 in words is "eighty-three million, nine hundred forty-five thousand, sixty-nine".