90781197 has 8 divisors (see below), whose sum is σ = 130352544. Its totient is φ = 55865328.

The previous prime is 90781193. The next prime is 90781199. The reversal of 90781197 is 79118709.

It is a happy number.

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

It is not a de Polignac number, because 90781197 - 2² = 90781193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781193) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1163823 + ... + 1163900.

It is an arithmetic number, because the mean of its divisors is an integer number (16294068).

Almost surely, 2^90781197 is an apocalyptic number.

It is an amenable number.

90781197 is a deficient number, since it is larger than the sum of its proper divisors (39571347).

90781197 is a wasteful number, since it uses less digits than its factorization.

90781197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327739.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 90781197 is about 9527.9167187796. The cubic root of 90781197 is about 449.4333559119.

The spelling of 90781197 in words is "ninety million, seven hundred eighty-one thousand, one hundred ninety-seven".