74778424 has 32 divisors (see below), whose sum is σ = 164152800. Its totient is φ = 31265280.

The previous prime is 74778421. The next prime is 74778437. The reversal of 74778424 is 42487747.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74778421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13989 + ... + 18580.

It is an arithmetic number, because the mean of its divisors is an integer number (5129775).

Almost surely, 2^74778424 is an apocalyptic number.

It is an amenable number.

74778424 is an abundant number, since it is smaller than the sum of its proper divisors (89374376).

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

74778424 is a wasteful number, since it uses less digits than its factorization.

74778424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32623 (or 32619 counting only the distinct ones).

The product of its digits is 351232, while the sum is 43.

The square root of 74778424 is about 8647.4518790219. The cubic root of 74778424 is about 421.3006242523.

The spelling of 74778424 in words is "seventy-four million, seven hundred seventy-eight thousand, four hundred twenty-four".