74961720 has 128 divisors (see below), whose sum is σ = 258048000. Its totient is φ = 19336320.

The previous prime is 74961709. The next prime is 74961743. The reversal of 74961720 is 2716947.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32361 + ... + 34599.

It is an arithmetic number, because the mean of its divisors is an integer number (2016000).

Almost surely, 2^74961720 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 74961720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129024000).

74961720 is an abundant number, since it is smaller than the sum of its proper divisors (183086280).

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

74961720 is a wasteful number, since it uses less digits than its factorization.

74961720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290 (or 2280 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 74961720 is about 8658.0436589336. The cubic root of 74961720 is about 421.6445724353.

It can be divided in two parts, 7496 and 1720, that added together give a square (9216 = 96²).

The spelling of 74961720 in words is "seventy-four million, nine hundred sixty-one thousand, seven hundred twenty".