84391761 has 16 divisors (see below), whose sum is σ = 117657216. Its totient is φ = 53703936.

The previous prime is 84391733. The next prime is 84391777. The reversal of 84391761 is 16719348.

It is not a de Polignac number, because 84391761 - 2⁵ = 84391729 is a prime.

It is a super-2 number, since 2×84391761² = 14243938649362242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84391781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44121 + ... + 45993.

It is an arithmetic number, because the mean of its divisors is an integer number (7353576).

Almost surely, 2^84391761 is an apocalyptic number.

It is an amenable number.

84391761 is a deficient number, since it is larger than the sum of its proper divisors (33265455).

84391761 is a wasteful number, since it uses less digits than its factorization.

84391761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552.

The product of its digits is 36288, while the sum is 39.

The square root of 84391761 is about 9186.4988434115. The cubic root of 84391761 is about 438.6317014528.

The spelling of 84391761 in words is "eighty-four million, three hundred ninety-one thousand, seven hundred sixty-one".