634066878 has 16 divisors (see below), whose sum is σ = 1292061456. Its totient is φ = 207367680.

The previous prime is 634066871. The next prime is 634066889. The reversal of 634066878 is 878660436.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634066871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 996643 + ... + 997278.

It is an arithmetic number, because the mean of its divisors is an integer number (80753841).

Almost surely, 2^634066878 is an apocalyptic number.

634066878 is an abundant number, since it is smaller than the sum of its proper divisors (657994578).

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

634066878 is a wasteful number, since it uses less digits than its factorization.

634066878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993979.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 634066878 is about 25180.6846213521. The cubic root of 634066878 is about 859.1025783665.

The spelling of 634066878 in words is "six hundred thirty-four million, sixty-six thousand, eight hundred seventy-eight".