2491487478 has 32 divisors (see below), whose sum is σ = 5540659200. Its totient is φ = 829892808.

The previous prime is 2491487473. The next prime is 2491487491. The reversal of 2491487478 is 8747841942.

2491487478 is a `hidden beast` number, since 2 + 4 + 91 + 4 + 87 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491487473) 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 15 ways as a sum of consecutive naturals, for example, 61675 + ... + 93737.

It is an arithmetic number, because the mean of its divisors is an integer number (173145600).

Almost surely, 2^2491487478 is an apocalyptic number.

2491487478 is an abundant number, since it is smaller than the sum of its proper divisors (3049171722).

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

2491487478 is a wasteful number, since it uses less digits than its factorization.

2491487478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33513 (or 33507 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 2491487478 is about 49914.8021933374. The cubic root of 2491487478 is about 1355.6666206046. Note that the first 4 decimals are identical.

The spelling of 2491487478 in words is "two billion, four hundred ninety-one million, four hundred eighty-seven thousand, four hundred seventy-eight".