74778745 has 4 divisors (see below), whose sum is σ = 89734500. Its totient is φ = 59822992.

The previous prime is 74778719. The next prime is 74778749. The reversal of 74778745 is 54787747.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8779369 + 65999376 = 2963^2 + 8124^2 .

It is a cyclic number.

It is not a de Polignac number, because 74778745 - 2⁵ = 74778713 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (74778749) 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, 7477870 + ... + 7477879.

It is an arithmetic number, because the mean of its divisors is an integer number (22433625).

Almost surely, 2^74778745 is an apocalyptic number.

It is an amenable number.

74778745 is a deficient number, since it is larger than the sum of its proper divisors (14955755).

74778745 is a wasteful number, since it uses less digits than its factorization.

74778745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14955754.

The product of its digits is 1536640, while the sum is 49.

The square root of 74778745 is about 8647.4704393828. The cubic root of 74778745 is about 421.3012270879.

The spelling of 74778745 in words is "seventy-four million, seven hundred seventy-eight thousand, seven hundred forty-five".