688194228 has 24 divisors (see below), whose sum is σ = 1649187232. Its totient is φ = 223197984.

The previous prime is 688194223. The next prime is 688194229. The reversal of 688194228 is 822491886.

It is a super-2 number, since 2×688194228² = 947222590905031968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688194223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774550 + ... + 775437.

Almost surely, 2^688194228 is an apocalyptic number.

It is an amenable number.

688194228 is an abundant number, since it is smaller than the sum of its proper divisors (960993004).

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

688194228 is a wasteful number, since it uses less digits than its factorization.

688194228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550031 (or 1550029 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 688194228 is about 26233.4562724777. The cubic root of 688194228 is about 882.8840586408.

The spelling of 688194228 in words is "six hundred eighty-eight million, one hundred ninety-four thousand, two hundred twenty-eight".