681749450 has 24 divisors (see below), whose sum is σ = 1334795520. Its totient is φ = 258346800.

The previous prime is 681749449. The next prime is 681749459. The reversal of 681749450 is 54947186.

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 11 ways as a sum of consecutive naturals, for example, 357866 + ... + 359765.

It is an arithmetic number, because the mean of its divisors is an integer number (55616480).

Almost surely, 2^681749450 is an apocalyptic number.

681749450 is a deficient number, since it is larger than the sum of its proper divisors (653046070).

681749450 is a wasteful number, since it uses less digits than its factorization.

681749450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717662 (or 717657 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 681749450 is about 26110.3322460669. The cubic root of 681749450 is about 880.1194095883.

The spelling of 681749450 in words is "six hundred eighty-one million, seven hundred forty-nine thousand, four hundred fifty".