681749452 has 12 divisors (see below), whose sum is σ = 1193793160. Its totient is φ = 340665696.

The previous prime is 681749449. The next prime is 681749459. The reversal of 681749452 is 254947186.

It is a super-3 number, since 3×681749452³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681749459) 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, 44802 + ... + 58057.

Almost surely, 2^681749452 is an apocalyptic number.

It is an amenable number.

681749452 is a deficient number, since it is larger than the sum of its proper divisors (512043708).

681749452 is a wasteful number, since it uses less digits than its factorization.

681749452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104520 (or 104518 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 681749452 is about 26110.3322843659. The cubic root of 681749452 is about 880.1194104489.

The spelling of 681749452 in words is "six hundred eighty-one million, seven hundred forty-nine thousand, four hundred fifty-two".