73890091 has 4 divisors (see below), whose sum is σ = 80607384. Its totient is φ = 67172800.

The previous prime is 73890083. The next prime is 73890097. The reversal of 73890091 is 19009837.

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

It is a cyclic number.

It is not a de Polignac number, because 73890091 - 2³ = 73890083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73890091.

It is not an unprimeable number, because it can be changed into a prime (73890097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3358630 + ... + 3358651.

It is an arithmetic number, because the mean of its divisors is an integer number (20151846).

Almost surely, 2^73890091 is an apocalyptic number.

73890091 is a deficient number, since it is larger than the sum of its proper divisors (6717293).

73890091 is a wasteful number, since it uses less digits than its factorization.

73890091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717292.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 73890091 is about 8595.9345623382. The cubic root of 73890091 is about 419.6256888044.

The spelling of 73890091 in words is "seventy-three million, eight hundred ninety thousand, ninety-one".