78275778 has 32 divisors (see below), whose sum is σ = 180510336. Its totient is φ = 22165248.

The previous prime is 78275773. The next prime is 78275779. The reversal of 78275778 is 87757287.

It is a super-2 number, since 2×78275778² = 12254194843010568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78275778.

It is not an unprimeable number, because it can be changed into a prime (78275773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3501 + ... + 12992.

It is an arithmetic number, because the mean of its divisors is an integer number (5640948).

Almost surely, 2^78275778 is an apocalyptic number.

78275778 is an abundant number, since it is smaller than the sum of its proper divisors (102234558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78275778 is a wasteful number, since it uses less digits than its factorization.

78275778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16618.

The product of its digits is 1536640, while the sum is 51.

The square root of 78275778 is about 8847.3599452040. The cubic root of 78275778 is about 427.7688251395.

The spelling of 78275778 in words is "seventy-eight million, two hundred seventy-five thousand, seven hundred seventy-eight".