90191026 has 8 divisors (see below), whose sum is σ = 138165120. Its totient is φ = 44135988.

The previous prime is 90190993. The next prime is 90191029. The reversal of 90191026 is 62019109.

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

It is a junction number, because it is equal to n+sod(n) for n = 90190985 and 90191003.

It is not an unprimeable number, because it can be changed into a prime (90191029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479646 + ... + 479833.

It is an arithmetic number, because the mean of its divisors is an integer number (17270640).

Almost surely, 2^90191026 is an apocalyptic number.

90191026 is a deficient number, since it is larger than the sum of its proper divisors (47974094).

90191026 is a wasteful number, since it uses less digits than its factorization.

90191026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959528.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 90191026 is about 9496.8955980362. The cubic root of 90191026 is about 448.4573116436.

The spelling of 90191026 in words is "ninety million, one hundred ninety-one thousand, twenty-six".