84742257 has 8 divisors (see below), whose sum is σ = 113738560. Its totient is φ = 56120400.

The previous prime is 84742219. The next prime is 84742267. The reversal of 84742257 is 75224748.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84742257 - 2⁶ = 84742193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84742267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93082 + ... + 93987.

It is an arithmetic number, because the mean of its divisors is an integer number (14217320).

Almost surely, 2^84742257 is an apocalyptic number.

It is an amenable number.

84742257 is a deficient number, since it is larger than the sum of its proper divisors (28996303).

84742257 is a wasteful number, since it uses less digits than its factorization.

84742257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187223.

The product of its digits is 125440, while the sum is 39.

The square root of 84742257 is about 9205.5557681218. Note that the first 3 decimals coincide. The cubic root of 84742257 is about 439.2381046880.

It can be divided in two parts, 8474 and 2257, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 84742257 in words is "eighty-four million, seven hundred forty-two thousand, two hundred fifty-seven".