74287161 has 45 divisors (see below), whose sum is σ = 123485531. Its totient is φ = 43026048.

The previous prime is 74287153. The next prime is 74287163. The reversal of 74287161 is 16178247.

The square root of 74287161 is 8619.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 67815225 + 6471936 = 8235^2 + 2544^2 .

It is not a de Polignac number, because 74287161 - 2³ = 74287153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74287163) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4369825 + ... + 4369841.

Almost surely, 2^74287161 is an apocalyptic number.

74287161 is the 8619-th square number.

74287161 is the 4310-th centered octagonal number.

It is an amenable number.

74287161 is a deficient number, since it is larger than the sum of its proper divisors (49198370).

74287161 is an equidigital number, since it uses as much as digits as its factorization.

74287161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 33 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The cubic root of 74287161 is about 420.3760068152.

Multiplying 74287161 by its sum of digits (36), we get a square (2674337796 = 51714²).

The spelling of 74287161 in words is "seventy-four million, two hundred eighty-seven thousand, one hundred sixty-one".