90261787 has 16 divisors (see below), whose sum is σ = 115282944. Its totient is φ = 68616000.

The previous prime is 90261767. The next prime is 90261793. The reversal of 90261787 is 78716209.

It is a cyclic number.

It is not a de Polignac number, because 90261787 - 2¹⁹ = 89737499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90261707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11139 + ... + 17452.

It is an arithmetic number, because the mean of its divisors is an integer number (7205184).

Almost surely, 2^90261787 is an apocalyptic number.

90261787 is a deficient number, since it is larger than the sum of its proper divisors (25021157).

90261787 is a wasteful number, since it uses less digits than its factorization.

90261787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28650.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 90261787 is about 9500.6203481667. The cubic root of 90261787 is about 448.5745627489.

The spelling of 90261787 in words is "ninety million, two hundred sixty-one thousand, seven hundred eighty-seven".