90749819 has 4 divisors (see below), whose sum is σ = 90884544. Its totient is φ = 90615096.

The previous prime is 90749797. The next prime is 90749821. The reversal of 90749819 is 91894709.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90749819 - 2⁸ = 90749563 is a prime.

It is a super-2 number, since 2×90749819² = 16471059297065522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90749899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66347 + ... + 67700.

It is an arithmetic number, because the mean of its divisors is an integer number (22721136).

Almost surely, 2^90749819 is an apocalyptic number.

90749819 is a deficient number, since it is larger than the sum of its proper divisors (134725).

90749819 is a wasteful number, since it uses less digits than its factorization.

90749819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134724.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 90749819 is about 9526.2699415878. The cubic root of 90749819 is about 449.3815685910.

The spelling of 90749819 in words is "ninety million, seven hundred forty-nine thousand, eight hundred nineteen".