84990715 has 4 divisors (see below), whose sum is σ = 101988864. Its totient is φ = 67992568.

The previous prime is 84990713. The next prime is 84990767. The reversal of 84990715 is 51709948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84990715 - 2¹ = 84990713 is a prime.

It is a super-2 number, since 2×84990715² = 14446843272422450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84990713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8499067 + ... + 8499076.

It is an arithmetic number, because the mean of its divisors is an integer number (25497216).

Almost surely, 2^84990715 is an apocalyptic number.

84990715 is a deficient number, since it is larger than the sum of its proper divisors (16998149).

84990715 is a wasteful number, since it uses less digits than its factorization.

84990715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16998148.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 84990715 is about 9219.0408937156. The cubic root of 84990715 is about 439.6669570001. Note that the first 3 decimals are identical.

The spelling of 84990715 in words is "eighty-four million, nine hundred ninety thousand, seven hundred fifteen".