74878445 has 4 divisors (see below), whose sum is σ = 89854140. Its totient is φ = 59902752.

The previous prime is 74878439. The next prime is 74878457. The reversal of 74878445 is 54487847.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54487847 = 89 ⋅612223.

It can be written as a sum of positive squares in 2 ways, for example, as 41550916 + 33327529 = 6446^2 + 5773^2 .

It is a cyclic number.

It is not a de Polignac number, because 74878445 - 2⁸ = 74878189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74878445.

It is a congruent number.

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, 7487840 + ... + 7487849.

It is an arithmetic number, because the mean of its divisors is an integer number (22463535).

Almost surely, 2^74878445 is an apocalyptic number.

It is an amenable number.

74878445 is a deficient number, since it is larger than the sum of its proper divisors (14975695).

74878445 is a wasteful number, since it uses less digits than its factorization.

74878445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14975694.

The product of its digits is 1003520, while the sum is 47.

The square root of 74878445 is about 8653.2332107716. The cubic root of 74878445 is about 421.4883795502.

The spelling of 74878445 in words is "seventy-four million, eight hundred seventy-eight thousand, four hundred forty-five".