688978072 has 16 divisors (see below), whose sum is σ = 1292727240. Its totient is φ = 344250816.

The previous prime is 688978051. The next prime is 688978079. The reversal of 688978072 is 270879886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688978079) 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, 17173 + ... + 40900.

Almost surely, 2^688978072 is an apocalyptic number.

It is an amenable number.

688978072 is a deficient number, since it is larger than the sum of its proper divisors (603749168).

688978072 is a wasteful number, since it uses less digits than its factorization.

688978072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59562 (or 59558 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 55.

The square root of 688978072 is about 26248.3917983560. The cubic root of 688978072 is about 883.2191291617.

The spelling of 688978072 in words is "six hundred eighty-eight million, nine hundred seventy-eight thousand, seventy-two".