634921023140 has 24 divisors (see below), whose sum is σ = 1333384839360. Its totient is φ = 253958753888.

The previous prime is 634921023097. The next prime is 634921023157. The reversal of 634921023140 is 41320129436.

It is a self number, because there is not a number n which added to its sum of digits gives 634921023140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51950 + ... + 1128069.

It is an arithmetic number, because the mean of its divisors is an integer number (55557701640).

Almost surely, 2^634921023140 is an apocalyptic number.

It is an amenable number.

634921023140 is an abundant number, since it is smaller than the sum of its proper divisors (698463816220).

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

634921023140 is a wasteful number, since it uses less digits than its factorization.

634921023140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206931 (or 1206929 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 634921023140 in words is "six hundred thirty-four billion, nine hundred twenty-one million, twenty-three thousand, one hundred forty".