90487879 has 4 divisors (see below), whose sum is σ = 90507184. Its totient is φ = 90468576.

The previous prime is 90487871. The next prime is 90487883. The reversal of 90487879 is 97878409.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97878409 = 23 ⋅4255583.

It is a cyclic number.

It is not a de Polignac number, because 90487879 - 2³ = 90487871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90487871) 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, 2374 + ... + 13660.

It is an arithmetic number, because the mean of its divisors is an integer number (22626796).

Almost surely, 2^90487879 is an apocalyptic number.

90487879 is a deficient number, since it is larger than the sum of its proper divisors (19305).

90487879 is a wasteful number, since it uses less digits than its factorization.

90487879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19304.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 90487879 is about 9512.5117082714. The cubic root of 90487879 is about 448.9487874024.

The spelling of 90487879 in words is "ninety million, four hundred eighty-seven thousand, eight hundred seventy-nine".