74409780 has 96 divisors (see below), whose sum is σ = 215728128. Its totient is φ = 19152000.

The previous prime is 74409773. The next prime is 74409781. The reversal of 74409780 is 8790447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74409781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389485 + ... + 389675.

It is an arithmetic number, because the mean of its divisors is an integer number (2247168).

Almost surely, 2^74409780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74409780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107864064).

74409780 is an abundant number, since it is smaller than the sum of its proper divisors (141318348).

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

74409780 is a wasteful number, since it uses less digits than its factorization.

74409780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 74409780 is about 8626.1103633098. The cubic root of 74409780 is about 420.6071717077.

The spelling of 74409780 in words is "seventy-four million, four hundred nine thousand, seven hundred eighty".