634278390 has 16 divisors (see below), whose sum is σ = 1522268208. Its totient is φ = 169140896.

The previous prime is 634278389. The next prime is 634278391. The reversal of 634278390 is 93872436.

It is an interprime number because it is at equal distance from previous prime (634278389) and next prime (634278391).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634278391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10571277 + ... + 10571336.

It is an arithmetic number, because the mean of its divisors is an integer number (95141763).

Almost surely, 2^634278390 is an apocalyptic number.

634278390 is an abundant number, since it is smaller than the sum of its proper divisors (887989818).

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

634278390 is a wasteful number, since it uses less digits than its factorization.

634278390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21142623.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 634278390 is about 25184.8841569700. The cubic root of 634278390 is about 859.1980942127.

It can be divided in two parts, 63427 and 8390, that added together give a palindrome (71817).

The spelling of 634278390 in words is "six hundred thirty-four million, two hundred seventy-eight thousand, three hundred ninety".