90121798 has 8 divisors (see below), whose sum is σ = 145581408. Its totient is φ = 41594664.

The previous prime is 90121793. The next prime is 90121817. The reversal of 90121798 is 89712109.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90121793) 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, 1733086 + ... + 1733137.

It is an arithmetic number, because the mean of its divisors is an integer number (18197676).

Almost surely, 2^90121798 is an apocalyptic number.

90121798 is a deficient number, since it is larger than the sum of its proper divisors (55459610).

90121798 is a wasteful number, since it uses less digits than its factorization.

90121798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466238.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 90121798 is about 9493.2501283807. The cubic root of 90121798 is about 448.3425413580.

The spelling of 90121798 in words is "ninety million, one hundred twenty-one thousand, seven hundred ninety-eight".