90699887 has 2 divisors, whose sum is σ = 90699888. Its totient is φ = 90699886.

The previous prime is 90699877. The next prime is 90699899. The reversal of 90699887 is 78899609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90699887 - 2¹² = 90695791 is a prime.

It is a super-3 number, since 3×90699887³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90699877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45349943 + 45349944.

It is an arithmetic number, because the mean of its divisors is an integer number (45349944).

Almost surely, 2^90699887 is an apocalyptic number.

90699887 is a deficient number, since it is larger than the sum of its proper divisors (1).

90699887 is an equidigital number, since it uses as much as digits as its factorization.

90699887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 90699887 is about 9523.6488280490. The cubic root of 90699887 is about 449.2991344979.

The spelling of 90699887 in words is "ninety million, six hundred ninety-nine thousand, eight hundred eighty-seven".