91473840 has 80 divisors (see below), whose sum is σ = 315084000. Its totient is φ = 24392448.

The previous prime is 91473817. The next prime is 91473869. The reversal of 91473840 is 4837419.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91473795 and 91473804.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19015 + ... + 23334.

It is an arithmetic number, because the mean of its divisors is an integer number (3938550).

Almost surely, 2^91473840 is an apocalyptic number.

91473840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91473840 is an abundant number, since it is smaller than the sum of its proper divisors (223610160).

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

91473840 is a wasteful number, since it uses less digits than its factorization.

91473840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42371 (or 42359 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 91473840 is about 9564.1957319996. The cubic root of 91473840 is about 450.5734910407.

The spelling of 91473840 in words is "ninety-one million, four hundred seventy-three thousand, eight hundred forty".