91030390 has 16 divisors (see below), whose sum is σ = 178750800. Its totient is φ = 33101920.

The previous prime is 91030367. The next prime is 91030403. The reversal of 91030390 is 9303019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413665 + ... + 413884.

It is an arithmetic number, because the mean of its divisors is an integer number (11171925).

Almost surely, 2^91030390 is an apocalyptic number.

91030390 is a deficient number, since it is larger than the sum of its proper divisors (87720410).

91030390 is a wasteful number, since it uses less digits than its factorization.

91030390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827567.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 91030390 is about 9540.9847500140. The cubic root of 91030390 is about 449.8442094458.

The spelling of 91030390 in words is "ninety-one million, thirty thousand, three hundred ninety".