78255801 has 20 divisors (see below), whose sum is σ = 125894692. Its totient is φ = 48156768.

The previous prime is 78255769. The next prime is 78255847. The reversal of 78255801 is 10855287.

78255801 is a `hidden beast` number, since 78 + 2 + 5 + 580 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25765776 + 52490025 = 5076^2 + 7245^2 .

It is not a de Polignac number, because 78255801 - 2⁵ = 78255769 is a prime.

It is a super-2 number, since 2×78255801² = 12247940780303202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78255871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36106 + ... + 38211.

Almost surely, 2^78255801 is an apocalyptic number.

It is an amenable number.

78255801 is a deficient number, since it is larger than the sum of its proper divisors (47638891).

78255801 is a wasteful number, since it uses less digits than its factorization.

78255801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74342 (or 74333 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 78255801 is about 8846.2308923066. The cubic root of 78255801 is about 427.7324313145.

The spelling of 78255801 in words is "seventy-eight million, two hundred fifty-five thousand, eight hundred one".