634285840 has 20 divisors (see below), whose sum is σ = 1474714764. Its totient is φ = 253714304.

The previous prime is 634285829. The next prime is 634285843. The reversal of 634285840 is 48582436.

634285840 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 2 ways, for example, as 222845184 + 411440656 = 14928^2 + 20284^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×634285840³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 634285793 and 634285802.

It is not an unprimeable number, because it can be changed into a prime (634285843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3964207 + ... + 3964366.

Almost surely, 2^634285840 is an apocalyptic number.

It is an amenable number.

634285840 is an abundant number, since it is smaller than the sum of its proper divisors (840428924).

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

634285840 is a wasteful number, since it uses less digits than its factorization.

634285840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928586 (or 7928580 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 634285840 is about 25185.0320627153. The cubic root of 634285840 is about 859.2014581409.

The spelling of 634285840 in words is "six hundred thirty-four million, two hundred eighty-five thousand, eight hundred forty".