74742778 has 32 divisors (see below), whose sum is σ = 135146880. Its totient is φ = 30581760.

The previous prime is 74742757. The next prime is 74742781. The reversal of 74742778 is 87724747.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4258 + ... + 12946.

It is an arithmetic number, because the mean of its divisors is an integer number (4223340).

Almost surely, 2^74742778 is an apocalyptic number.

74742778 is a deficient number, since it is larger than the sum of its proper divisors (60404102).

74742778 is a wasteful number, since it uses less digits than its factorization.

74742778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8742.

The product of its digits is 614656, while the sum is 46.

The square root of 74742778 is about 8645.3905637629. The cubic root of 74742778 is about 421.2336705860.

The spelling of 74742778 in words is "seventy-four million, seven hundred forty-two thousand, seven hundred seventy-eight".