74651643 has 12 divisors (see below), whose sum is σ = 117633048. Its totient is φ = 45243360.

The previous prime is 74651623. The next prime is 74651669. The reversal of 74651643 is 34615647.

It is a happy number.

74651643 is a `hidden beast` number, since 7 + 4 + 6 + 5 + 1 + 643 = 666.

It is not a de Polignac number, because 74651643 - 2⁸ = 74651387 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 74651598 and 74651607.

It is not an unprimeable number, because it can be changed into a prime (74651623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376930 + ... + 377127.

It is an arithmetic number, because the mean of its divisors is an integer number (9802754).

Almost surely, 2^74651643 is an apocalyptic number.

74651643 is a deficient number, since it is larger than the sum of its proper divisors (42981405).

74651643 is a wasteful number, since it uses less digits than its factorization.

74651643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754074 (or 754071 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 74651643 is about 8640.1182283578. The cubic root of 74651643 is about 421.0623954252.

The spelling of 74651643 in words is "seventy-four million, six hundred fifty-one thousand, six hundred forty-three".