90387861 has 32 divisors (see below), whose sum is σ = 134120448. Its totient is φ = 53856000.

The previous prime is 90387853. The next prime is 90387877. The reversal of 90387861 is 16878309.

It is not a de Polignac number, because 90387861 - 2³ = 90387853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90387811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294270 + ... + 294576.

It is an arithmetic number, because the mean of its divisors is an integer number (4191264).

Almost surely, 2^90387861 is an apocalyptic number.

It is an amenable number.

90387861 is a deficient number, since it is larger than the sum of its proper divisors (43732587).

90387861 is a wasteful number, since it uses less digits than its factorization.

90387861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 90387861 is about 9507.2530733120. The cubic root of 90387861 is about 448.7833158331.

The spelling of 90387861 in words is "ninety million, three hundred eighty-seven thousand, eight hundred sixty-one".