7516497978 has 96 divisors (see below), whose sum is σ = 18856676160. Its totient is φ = 2216095200.

The previous prime is 7516497917. The next prime is 7516498039. The reversal of 7516497978 is 8797946157.

7516497978 is a `hidden beast` number, since 7 + 51 + 6 + 497 + 97 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (7516497917) and next prime (7516498039).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226213 + ... + 257303.

It is an arithmetic number, because the mean of its divisors is an integer number (196423710).

Almost surely, 2^7516497978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7516497978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9428338080).

7516497978 is an abundant number, since it is smaller than the sum of its proper divisors (11340178182).

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

7516497978 is a wasteful number, since it uses less digits than its factorization.

7516497978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31161 (or 31144 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The square root of 7516497978 is about 86697.7391746751. The cubic root of 7516497978 is about 1958.8680450226.

The spelling of 7516497978 in words is "seven billion, five hundred sixteen million, four hundred ninety-seven thousand, nine hundred seventy-eight".