90127891 has 8 divisors (see below), whose sum is σ = 103660640. Its totient is φ = 76759488.

The previous prime is 90127889. The next prime is 90127913. The reversal of 90127891 is 19872109.

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 90127891 - 2¹ = 90127889 is a prime.

It is a super-2 number, since 2×90127891² = 16246073472215762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90127891.

It is not an unprimeable number, because it can be changed into a prime (90127831) 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, 39906 + ... + 42103.

It is an arithmetic number, because the mean of its divisors is an integer number (12957580).

Almost surely, 2^90127891 is an apocalyptic number.

90127891 is a deficient number, since it is larger than the sum of its proper divisors (13532749).

90127891 is a wasteful number, since it uses less digits than its factorization.

90127891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82173.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 90127891 is about 9493.5710351795. The cubic root of 90127891 is about 448.3526450532.

The spelling of 90127891 in words is "ninety million, one hundred twenty-seven thousand, eight hundred ninety-one".