91020048 has 60 divisors (see below), whose sum is σ = 273531600. Its totient is φ = 26005056.

The previous prime is 91020029. The next prime is 91020049. The reversal of 91020048 is 84002019.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (91020049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16998 + ... + 21701.

It is an arithmetic number, because the mean of its divisors is an integer number (4558860).

Almost surely, 2^91020048 is an apocalyptic number.

91020048 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

91020048 is an abundant number, since it is smaller than the sum of its proper divisors (182511552).

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

91020048 is a wasteful number, since it uses less digits than its factorization.

91020048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38724 (or 38711 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 91020048 is about 9540.4427570213. The cubic root of 91020048 is about 449.8271731388.

The spelling of 91020048 in words is "ninety-one million, twenty thousand, forty-eight".