90712987 has 4 divisors (see below), whose sum is σ = 91050480. Its totient is φ = 90375496.

The previous prime is 90712981. The next prime is 90712991. The reversal of 90712987 is 78921709.

It is a happy number.

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 90712987 - 2¹⁹ = 90188699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90712981) 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, 168343 + ... + 168880.

It is an arithmetic number, because the mean of its divisors is an integer number (22762620).

Almost surely, 2^90712987 is an apocalyptic number.

90712987 is a deficient number, since it is larger than the sum of its proper divisors (337493).

90712987 is a wasteful number, since it uses less digits than its factorization.

90712987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337492.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 90712987 is about 9524.3365648217. The cubic root of 90712987 is about 449.3207645701.

The spelling of 90712987 in words is "ninety million, seven hundred twelve thousand, nine hundred eighty-seven".