82780075 has 24 divisors (see below), whose sum is σ = 121103360. Its totient is φ = 54928800.

The previous prime is 82780073. The next prime is 82780081. The reversal of 82780075 is 57008728.

It is not a de Polignac number, because 82780075 - 2¹ = 82780073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82780073) 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, 2205 + ... + 13054.

Almost surely, 2^82780075 is an apocalyptic number.

82780075 is a deficient number, since it is larger than the sum of its proper divisors (38323285).

82780075 is a wasteful number, since it uses less digits than its factorization.

82780075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15307 (or 15302 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 82780075 is about 9098.3556206603. The cubic root of 82780075 is about 435.8214539116.

The spelling of 82780075 in words is "eighty-two million, seven hundred eighty thousand, seventy-five".