90643861 has 16 divisors (see below), whose sum is σ = 113401728. Its totient is φ = 70387200.

The previous prime is 90643859. The next prime is 90643867. The reversal of 90643861 is 16834609.

It is a cyclic number.

It is not a de Polignac number, because 90643861 - 2¹ = 90643859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90643861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90643867) 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, 22221 + ... + 25981.

It is an arithmetic number, because the mean of its divisors is an integer number (7087608).

Almost surely, 2^90643861 is an apocalyptic number.

It is an amenable number.

90643861 is a deficient number, since it is larger than the sum of its proper divisors (22757867).

90643861 is a wasteful number, since it uses less digits than its factorization.

90643861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 90643861 is about 9520.7069590446. The cubic root of 90643861 is about 449.2066036286.

The spelling of 90643861 in words is "ninety million, six hundred forty-three thousand, eight hundred sixty-one".