74709945 has 40 divisors (see below), whose sum is σ = 138564360. Its totient is φ = 38465280.

The previous prime is 74709937. The next prime is 74709949. The reversal of 74709945 is 54990747.

It can be written as a sum of positive squares in 4 ways, for example, as 2985984 + 71723961 = 1728^2 + 8469^2 .

It is not a de Polignac number, because 74709945 - 2³ = 74709937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 74709945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74709949) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8565 + ... + 14925.

It is an arithmetic number, because the mean of its divisors is an integer number (3464109).

Almost surely, 2^74709945 is an apocalyptic number.

It is an amenable number.

74709945 is a deficient number, since it is larger than the sum of its proper divisors (63854415).

74709945 is a wasteful number, since it uses less digits than its factorization.

74709945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6407 (or 6398 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 74709945 is about 8643.4914820343. The cubic root of 74709945 is about 421.1719817241.

The spelling of 74709945 in words is "seventy-four million, seven hundred nine thousand, nine hundred forty-five".