90978201 has 8 divisors (see below), whose sum is σ = 134782560. Its totient is φ = 60652116.

The previous prime is 90978197. The next prime is 90978233. The reversal of 90978201 is 10287909.

It is a happy number.

It is not a de Polignac number, because 90978201 - 2² = 90978197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90978281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1684755 + ... + 1684808.

It is an arithmetic number, because the mean of its divisors is an integer number (16847820).

Almost surely, 2^90978201 is an apocalyptic number.

It is an amenable number.

90978201 is a deficient number, since it is larger than the sum of its proper divisors (43804359).

90978201 is a wasteful number, since it uses less digits than its factorization.

90978201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369572 (or 3369566 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 90978201 is about 9538.2493676775. The cubic root of 90978201 is about 449.7582256792.

The spelling of 90978201 in words is "ninety million, nine hundred seventy-eight thousand, two hundred one".