87890615 has 8 divisors (see below), whose sum is σ = 106654320. Its totient is φ = 69522112.

The previous prime is 87890603. The next prime is 87890617. The reversal of 87890615 is 51609878.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87890615 - 2⁸ = 87890359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87890617) 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, 98309 + ... + 99198.

It is an arithmetic number, because the mean of its divisors is an integer number (13331790).

Almost surely, 2^87890615 is an apocalyptic number.

87890615 is a deficient number, since it is larger than the sum of its proper divisors (18763705).

87890615 is a wasteful number, since it uses less digits than its factorization.

87890615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197601.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 87890615 is about 9374.9994666667. Note that the first 3 decimals coincide. The cubic root of 87890615 is about 444.6116461989.

The spelling of 87890615 in words is "eighty-seven million, eight hundred ninety thousand, six hundred fifteen".