91454903640 has 96 divisors (see below), whose sum is σ = 297824670000. Its totient is φ = 24339052800.

The previous prime is 91454903623. The next prime is 91454903653. The reversal of 91454903640 is 4630945419.

91454903640 is a `hidden beast` number, since 91 + 4 + 5 + 490 + 36 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 74911 + ... + 434190.

Almost surely, 2^91454903640 is an apocalyptic number.

91454903640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91454903640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148912335000).

91454903640 is an abundant number, since it is smaller than the sum of its proper divisors (206369766360).

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

91454903640 is a wasteful number, since it uses less digits than its factorization.

91454903640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509617 (or 509610 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 91454903640 in words is "ninety-one billion, four hundred fifty-four million, nine hundred three thousand, six hundred forty".