90816787 has 4 divisors (see below), whose sum is σ = 90874840. Its totient is φ = 90758736.

The previous prime is 90816767. The next prime is 90816797. The reversal of 90816787 is 78761809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78761809 = 7 ⋅11251687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90816787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90816727) 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, 26613 + ... + 29830.

It is an arithmetic number, because the mean of its divisors is an integer number (22718710).

Almost surely, 2^90816787 is an apocalyptic number.

90816787 is a deficient number, since it is larger than the sum of its proper divisors (58053).

90816787 is a wasteful number, since it uses less digits than its factorization.

90816787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58052.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 90816787 is about 9529.7842053218. The cubic root of 90816787 is about 449.4920804196.

The spelling of 90816787 in words is "ninety million, eight hundred sixteen thousand, seven hundred eighty-seven".