78082775 has 12 divisors (see below), whose sum is σ = 97588992. Its totient is φ = 61971840.

The previous prime is 78082759. The next prime is 78082777. The reversal of 78082775 is 57728087.

It is not a de Polignac number, because 78082775 - 2⁴ = 78082759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78082777) 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, 9122 + ... + 15471.

It is an arithmetic number, because the mean of its divisors is an integer number (8132416).

Almost surely, 2^78082775 is an apocalyptic number.

78082775 is a deficient number, since it is larger than the sum of its proper divisors (19506217).

78082775 is a wasteful number, since it uses less digits than its factorization.

78082775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24730 (or 24725 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 78082775 is about 8836.4458352892. The cubic root of 78082775 is about 427.4169554729.

The spelling of 78082775 in words is "seventy-eight million, eighty-two thousand, seven hundred seventy-five".