74550891 has 4 divisors (see below), whose sum is σ = 99401192. Its totient is φ = 49700592.

The previous prime is 74550857. The next prime is 74550911. The reversal of 74550891 is 19805547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19805547 = 3 ⋅6601849.

It is not a de Polignac number, because 74550891 - 2⁹ = 74550379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74550811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12425146 + ... + 12425151.

It is an arithmetic number, because the mean of its divisors is an integer number (24850298).

Almost surely, 2^74550891 is an apocalyptic number.

74550891 is a deficient number, since it is larger than the sum of its proper divisors (24850301).

74550891 is a wasteful number, since it uses less digits than its factorization.

74550891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24850300.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 74550891 is about 8634.2857840125. The cubic root of 74550891 is about 420.8728841783.

The spelling of 74550891 in words is "seventy-four million, five hundred fifty thousand, eight hundred ninety-one".