90921830 has 8 divisors (see below), whose sum is σ = 163659312. Its totient is φ = 36368728.

The previous prime is 90921827. The next prime is 90921833. The reversal of 90921830 is 3812909.

It is an interprime number because it is at equal distance from previous prime (90921827) and next prime (90921833).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90921833) 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, 4546082 + ... + 4546101.

It is an arithmetic number, because the mean of its divisors is an integer number (20457414).

Almost surely, 2^90921830 is an apocalyptic number.

90921830 is a deficient number, since it is larger than the sum of its proper divisors (72737482).

90921830 is a wasteful number, since it uses less digits than its factorization.

90921830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092190.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 90921830 is about 9535.2939126175. The cubic root of 90921830 is about 449.6653149275.

The spelling of 90921830 in words is "ninety million, nine hundred twenty-one thousand, eight hundred thirty".