74643261 has 16 divisors (see below), whose sum is σ = 124082688. Its totient is φ = 38775600.

The previous prime is 74643251. The next prime is 74643263. The reversal of 74643261 is 16234647.

It is a happy number.

It is not a de Polignac number, because 74643261 - 2⁶ = 74643197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74643263) 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 15 ways as a sum of consecutive naturals, for example, 161335 + ... + 161796.

It is an arithmetic number, because the mean of its divisors is an integer number (7755168).

Almost surely, 2^74643261 is an apocalyptic number.

It is an amenable number.

74643261 is a deficient number, since it is larger than the sum of its proper divisors (49439427).

74643261 is a wasteful number, since it uses less digits than its factorization.

74643261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323152.

The product of its digits is 24192, while the sum is 33.

The square root of 74643261 is about 8639.6331519342. The cubic root of 74643261 is about 421.0466356600.

The spelling of 74643261 in words is "seventy-four million, six hundred forty-three thousand, two hundred sixty-one".