74647440 has 160 divisors (see below), whose sum is σ = 293909760. Its totient is φ = 17058816.

The previous prime is 74647439. The next prime is 74647453. The reversal of 74647440 is 4474647.

74647440 is a `hidden beast` number, since 7 + 4 + 647 + 4 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 74647395 and 74647404.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 12652 + ... + 17588.

It is an arithmetic number, because the mean of its divisors is an integer number (1836936).

Almost surely, 2^74647440 is an apocalyptic number.

74647440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74647440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146954880).

74647440 is an abundant number, since it is smaller than the sum of its proper divisors (219262320).

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

74647440 is a wasteful number, since it uses less digits than its factorization.

74647440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966 (or 4954 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 74647440 is about 8639.8749990958. The cubic root of 74647440 is about 421.0544931277.

The spelling of 74647440 in words is "seventy-four million, six hundred forty-seven thousand, four hundred forty".