84215745 has 12 divisors (see below), whose sum is σ = 145974036. Its totient is φ = 44915040.

The previous prime is 84215723. The next prime is 84215749. The reversal of 84215745 is 54751248.

84215745 is a `hidden beast` number, since 84 + 2 + 1 + 574 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11778624 + 72437121 = 3432^2 + 8511^2 .

It is not a de Polignac number, because 84215745 - 2⁷ = 84215617 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (84215749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 935686 + ... + 935775.

It is an arithmetic number, because the mean of its divisors is an integer number (12164503).

Almost surely, 2^84215745 is an apocalyptic number.

It is an amenable number.

84215745 is a deficient number, since it is larger than the sum of its proper divisors (61758291).

84215745 is a wasteful number, since it uses less digits than its factorization.

84215745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871472 (or 1871469 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 84215745 is about 9176.9136968809. The cubic root of 84215745 is about 438.3265376339.

The spelling of 84215745 in words is "eighty-four million, two hundred fifteen thousand, seven hundred forty-five".