74945645 has 4 divisors (see below), whose sum is σ = 89934780. Its totient is φ = 59956512.

The previous prime is 74945627. The next prime is 74945653. The reversal of 74945645 is 54654947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54654947 = 1801 ⋅30347.

It can be written as a sum of positive squares in 2 ways, for example, as 12013156 + 62932489 = 3466^2 + 7933^2 .

It is a cyclic number.

It is not a de Polignac number, because 74945645 - 2¹⁰ = 74944621 is a prime.

It is a super-3 number, since 3×74945645³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 74945596 and 74945605.

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, 7494560 + ... + 7494569.

It is an arithmetic number, because the mean of its divisors is an integer number (22483695).

Almost surely, 2^74945645 is an apocalyptic number.

It is an amenable number.

74945645 is a deficient number, since it is larger than the sum of its proper divisors (14989135).

74945645 is a wasteful number, since it uses less digits than its factorization.

74945645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14989134.

The product of its digits is 604800, while the sum is 44.

The square root of 74945645 is about 8657.1152816628. The cubic root of 74945645 is about 421.6144307352.

The spelling of 74945645 in words is "seventy-four million, nine hundred forty-five thousand, six hundred forty-five".