687194474 has 4 divisors (see below), whose sum is σ = 1030791714. Its totient is φ = 343597236.

The previous prime is 687194461. The next prime is 687194477. The reversal of 687194474 is 474491786.

687194474 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 474491786 = 2 ⋅237245893.

It can be written as a sum of positive squares in only one way, i.e., 556252225 + 130942249 = 23585^2 + 11443^2 .

It is a super-2 number, since 2×687194474² = 944472490192273352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687194477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171798617 + ... + 171798620.

Almost surely, 2^687194474 is an apocalyptic number.

687194474 is a deficient number, since it is larger than the sum of its proper divisors (343597240).

687194474 is a wasteful number, since it uses less digits than its factorization.

687194474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343597239.

The product of its digits is 1354752, while the sum is 50.

The square root of 687194474 is about 26214.3944046015. The cubic root of 687194474 is about 882.4563234650.

The spelling of 687194474 in words is "six hundred eighty-seven million, one hundred ninety-four thousand, four hundred seventy-four".