78330778 has 24 divisors (see below), whose sum is σ = 126089568. Its totient is φ = 36407448.

The previous prime is 78330751. The next prime is 78330823. The reversal of 78330778 is 87703387.

It is a happy number.

It is a super-2 number, since 2×78330778² = 12271421564170568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393523 + ... + 393721.

It is an arithmetic number, because the mean of its divisors is an integer number (5253732).

Almost surely, 2^78330778 is an apocalyptic number.

78330778 is a deficient number, since it is larger than the sum of its proper divisors (47758790).

78330778 is a wasteful number, since it uses less digits than its factorization.

78330778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 78330778 is about 8850.4676712590. The cubic root of 78330778 is about 427.8689914051.

The spelling of 78330778 in words is "seventy-eight million, three hundred thirty thousand, seven hundred seventy-eight".