74521779 has 16 divisors (see below), whose sum is σ = 101523840. Its totient is φ = 48608640.

The previous prime is 74521757. The next prime is 74521823. The reversal of 74521779 is 97712547.

It is not a de Polignac number, because 74521779 - 2⁷ = 74521651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74521779.

It is not an unprimeable number, because it can be changed into a prime (74521079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41784 + ... + 43530.

It is an arithmetic number, because the mean of its divisors is an integer number (6345240).

Almost surely, 2^74521779 is an apocalyptic number.

74521779 is a deficient number, since it is larger than the sum of its proper divisors (27002061).

74521779 is a wasteful number, since it uses less digits than its factorization.

74521779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

The product of its digits is 123480, while the sum is 42.

The square root of 74521779 is about 8632.5997822209. The cubic root of 74521779 is about 420.8180936568.

The spelling of 74521779 in words is "seventy-four million, five hundred twenty-one thousand, seven hundred seventy-nine".