90845887 has 4 divisors (see below), whose sum is σ = 99104616. Its totient is φ = 82587160.

The previous prime is 90845827. The next prime is 90845927. The reversal of 90845887 is 78854809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78854809 = 11 ⋅7168619.

It is a cyclic number.

It is not a de Polignac number, because 90845887 - 2¹¹ = 90843839 is a prime.

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 90845887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90845827) 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, 4129348 + ... + 4129369.

It is an arithmetic number, because the mean of its divisors is an integer number (24776154).

Almost surely, 2^90845887 is an apocalyptic number.

90845887 is a deficient number, since it is larger than the sum of its proper divisors (8258729).

90845887 is a wasteful number, since it uses less digits than its factorization.

90845887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258728.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 90845887 is about 9531.3108752154. The cubic root of 90845887 is about 449.5400848439.

The spelling of 90845887 in words is "ninety million, eight hundred forty-five thousand, eight hundred eighty-seven".