74721380 has 12 divisors (see below), whose sum is σ = 156914940. Its totient is φ = 29888544.

The previous prime is 74721379. The next prime is 74721391. The reversal of 74721380 is 8312747.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18800896 + 55920484 = 4336^2 + 7478^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868015 + ... + 1868054.

It is an arithmetic number, because the mean of its divisors is an integer number (13076245).

Almost surely, 2^74721380 is an apocalyptic number.

It is an amenable number.

74721380 is an abundant number, since it is smaller than the sum of its proper divisors (82193560).

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

74721380 is a wasteful number, since it uses less digits than its factorization.

74721380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736078 (or 3736076 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 74721380 is about 8644.1529371015. The cubic root of 74721380 is about 421.1934686266.

The spelling of 74721380 in words is "seventy-four million, seven hundred twenty-one thousand, three hundred eighty".