83378945 has 24 divisors (see below), whose sum is σ = 110860344. Its totient is φ = 59844096.

The previous prime is 83378927. The next prime is 83378947. The reversal of 83378945 is 54987338.

It can be written as a sum of positive squares in 12 ways, for example, as 17833729 + 65545216 = 4223^2 + 8096^2 .

It is not a de Polignac number, because 83378945 - 2²⁶ = 16270081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83378945.

It is not an unprimeable number, because it can be changed into a prime (83378947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88517 + ... + 89453.

It is an arithmetic number, because the mean of its divisors is an integer number (4619181).

Almost surely, 2^83378945 is an apocalyptic number.

It is an amenable number.

83378945 is a deficient number, since it is larger than the sum of its proper divisors (27481399).

83378945 is a wasteful number, since it uses less digits than its factorization.

83378945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 992 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The square root of 83378945 is about 9131.2072038696. The cubic root of 83378945 is about 436.8699087552.

The spelling of 83378945 in words is "eighty-three million, three hundred seventy-eight thousand, nine hundred forty-five".