634720834 has 32 divisors (see below), whose sum is σ = 1085736960. Its totient is φ = 275470800.

The previous prime is 634720831. The next prime is 634720841. The reversal of 634720834 is 438027436.

It is a happy number.

It is a super-2 number, since 2×634720834² = 805741074227311112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 634720793 and 634720802.

It is not an unprimeable number, because it can be changed into a prime (634720831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514999 + ... + 516229.

It is an arithmetic number, because the mean of its divisors is an integer number (33929280).

Almost surely, 2^634720834 is an apocalyptic number.

634720834 is a deficient number, since it is larger than the sum of its proper divisors (451016126).

634720834 is a wasteful number, since it uses less digits than its factorization.

634720834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286.

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 634720834 is about 25193.6665453840. Note that the first 3 decimals coincide. The cubic root of 634720834 is about 859.3978270591.

The spelling of 634720834 in words is "six hundred thirty-four million, seven hundred twenty thousand, eight hundred thirty-four".