688145970 has 64 divisors (see below), whose sum is σ = 1727308800. Its totient is φ = 175124928.

The previous prime is 688145957. The next prime is 688145999. The reversal of 688145970 is 79541886.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404181 + ... + 405879.

It is an arithmetic number, because the mean of its divisors is an integer number (26989200).

Almost surely, 2^688145970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688145970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863654400).

688145970 is an abundant number, since it is smaller than the sum of its proper divisors (1039162830).

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

688145970 is a wasteful number, since it uses less digits than its factorization.

688145970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 688145970 is about 26232.5364766734. The cubic root of 688145970 is about 882.8634214364.

The spelling of 688145970 in words is "six hundred eighty-eight million, one hundred forty-five thousand, nine hundred seventy".