991619460 has 72 divisors (see below), whose sum is σ = 3239297880. Its totient is φ = 244090368.

The previous prime is 991619459. The next prime is 991619479. The reversal of 991619460 is 64916199.

991619460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 138862656 + 852756804 = 11784^2 + 29202^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

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, 209545 + ... + 214224.

Almost surely, 2^991619460 is an apocalyptic number.

991619460 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991619460 is an abundant number, since it is smaller than the sum of its proper divisors (2247678420).

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

991619460 is a wasteful number, since it uses less digits than its factorization.

991619460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423797 (or 423792 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 991619460 is about 31489.9898380422. The cubic root of 991619460 is about 997.1986464127.

The spelling of 991619460 in words is "nine hundred ninety-one million, six hundred nineteen thousand, four hundred sixty".