90647820 has 36 divisors (see below), whose sum is σ = 274965600. Its totient is φ = 24172704.

The previous prime is 90647801. The next prime is 90647833. The reversal of 90647820 is 2874609.

90647820 is a `hidden beast` number, since 9 + 0 + 647 + 8 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251620 + ... + 251979.

Almost surely, 2^90647820 is an apocalyptic number.

90647820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

90647820 is an abundant number, since it is smaller than the sum of its proper divisors (184317780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90647820 is a wasteful number, since it uses less digits than its factorization.

90647820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503614 (or 503609 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 90647820 is about 9520.9148720068. The cubic root of 90647820 is about 449.2131434466.

The spelling of 90647820 in words is "ninety million, six hundred forty-seven thousand, eight hundred twenty".