90075787 has 4 divisors (see below), whose sum is σ = 90394360. Its totient is φ = 89757216.

The previous prime is 90075781. The next prime is 90075857. The reversal of 90075787 is 78757009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78757009 = 157 ⋅501637.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90075787 is a prime.

It is a super-2 number, since 2×90075787² = 16227294807338738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90075781) 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, 158862 + ... + 159427.

It is an arithmetic number, because the mean of its divisors is an integer number (22598590).

Almost surely, 2^90075787 is an apocalyptic number.

90075787 is a deficient number, since it is larger than the sum of its proper divisors (318573).

90075787 is a wasteful number, since it uses less digits than its factorization.

90075787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318572.

The product of its (nonzero) digits is 123480, while the sum is 43.

The square root of 90075787 is about 9490.8264655930. The cubic root of 90075787 is about 448.2662290757.

The spelling of 90075787 in words is "ninety million, seventy-five thousand, seven hundred eighty-seven".