764454978 has 144 divisors (see below), whose sum is σ = 2021400576. Its totient is φ = 207930240.

The previous prime is 764454937. The next prime is 764455001. The reversal of 764454978 is 879454467.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 1995775 + ... + 1996157.

It is an arithmetic number, because the mean of its divisors is an integer number (14037504).

Almost surely, 2^764454978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 764454978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010700288).

764454978 is an abundant number, since it is smaller than the sum of its proper divisors (1256945598).

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

764454978 is a wasteful number, since it uses less digits than its factorization.

764454978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 499 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The square root of 764454978 is about 27648.7789603809. The cubic root of 764454978 is about 914.3601797770.

The spelling of 764454978 in words is "seven hundred sixty-four million, four hundred fifty-four thousand, nine hundred seventy-eight".