91243790 has 32 divisors (see below), whose sum is σ = 180278784. Its totient is φ = 32974240.

The previous prime is 91243759. The next prime is 91243837. The reversal of 91243790 is 9734219.

It is a self number, because there is not a number n which added to its sum of digits gives 91243790.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15887 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (5633712).

Almost surely, 2^91243790 is an apocalyptic number.

91243790 is a deficient number, since it is larger than the sum of its proper divisors (89034994).

91243790 is a wasteful number, since it uses less digits than its factorization.

91243790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 91243790 is about 9552.1615354850. The cubic root of 91243790 is about 450.1954541883.

The spelling of 91243790 in words is "ninety-one million, two hundred forty-three thousand, seven hundred ninety".