91345890 has 16 divisors (see below), whose sum is σ = 219230208. Its totient is φ = 24358896.

The previous prime is 91345873. The next prime is 91345931. The reversal of 91345890 is 9854319.

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, 1522402 + ... + 1522461.

It is an arithmetic number, because the mean of its divisors is an integer number (13701888).

Almost surely, 2^91345890 is an apocalyptic number.

91345890 is an abundant number, since it is smaller than the sum of its proper divisors (127884318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91345890 is a wasteful number, since it uses less digits than its factorization.

91345890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044873.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 91345890 is about 9557.5043813749. The cubic root of 91345890 is about 450.3633115365.

It can be divided in two parts, 91345 and 890, that added together give a triangular number (92235 = T₄₂₉).

The spelling of 91345890 in words is "ninety-one million, three hundred forty-five thousand, eight hundred ninety".