91474719840 has 144 divisors (see below), whose sum is σ = 356751446688. Its totient is φ = 20908505088.

The previous prime is 91474719823. The next prime is 91474719871. The reversal of 91474719840 is 4891747419.

91474719840 is a `hidden beast` number, since 9 + 1 + 47 + 471 + 98 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4527357 + ... + 4547516.

It is an arithmetic number, because the mean of its divisors is an integer number (2477440602).

Almost surely, 2^91474719840 is an apocalyptic number.

91474719840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91474719840 is an abundant number, since it is smaller than the sum of its proper divisors (265276726848).

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

91474719840 is a wasteful number, since it uses less digits than its factorization.

91474719840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9074901 (or 9074890 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 91474719840 in words is "ninety-one billion, four hundred seventy-four million, seven hundred nineteen thousand, eight hundred forty".