83781725 has 12 divisors (see below), whose sum is σ = 107472660. Its totient is φ = 64713600.

The previous prime is 83781721. The next prime is 83781739. The reversal of 83781725 is 52718738.

It can be written as a sum of positive squares in 6 ways, for example, as 15007876 + 68773849 = 3874^2 + 8293^2 .

It is not a de Polignac number, because 83781725 - 2² = 83781721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83781721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57056 + ... + 58505.

It is an arithmetic number, because the mean of its divisors is an integer number (8956055).

Almost surely, 2^83781725 is an apocalyptic number.

It is an amenable number.

83781725 is a deficient number, since it is larger than the sum of its proper divisors (23690935).

83781725 is a wasteful number, since it uses less digits than its factorization.

83781725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115600 (or 115595 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 83781725 is about 9153.2357666565. The cubic root of 83781725 is about 437.5722438521.

The spelling of 83781725 in words is "eighty-three million, seven hundred eighty-one thousand, seven hundred twenty-five".