90101812 has 24 divisors (see below), whose sum is σ = 160425216. Its totient is φ = 44272128.

The previous prime is 90101777. The next prime is 90101831. The reversal of 90101812 is 21810109.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73428 + ... + 74644.

It is an arithmetic number, because the mean of its divisors is an integer number (6684384).

Almost surely, 2^90101812 is an apocalyptic number.

It is an amenable number.

90101812 is a deficient number, since it is larger than the sum of its proper divisors (70323404).

90101812 is a wasteful number, since it uses less digits than its factorization.

90101812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 90101812 is about 9492.1974273611. The cubic root of 90101812 is about 448.3093964485.

The spelling of 90101812 in words is "ninety million, one hundred one thousand, eight hundred twelve".