90806387 has 4 divisors (see below), whose sum is σ = 103778736. Its totient is φ = 77834040.

The previous prime is 90806363. The next prime is 90806413. The reversal of 90806387 is 78360809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78360809 = 2039 ⋅38431.

It is a cyclic number.

It is not a de Polignac number, because 90806387 - 2¹⁴ = 90790003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90806327) 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, 6486164 + ... + 6486177.

It is an arithmetic number, because the mean of its divisors is an integer number (25944684).

Almost surely, 2^90806387 is an apocalyptic number.

90806387 is a deficient number, since it is larger than the sum of its proper divisors (12972349).

90806387 is a wasteful number, since it uses less digits than its factorization.

90806387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12972348.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 90806387 is about 9529.2385320129. The cubic root of 90806387 is about 449.4749217120.

The spelling of 90806387 in words is "ninety million, eight hundred six thousand, three hundred eighty-seven".