688735742 has 16 divisors (see below), whose sum is σ = 1086556032. Its totient is φ = 326969760.

The previous prime is 688735741. The next prime is 688735757. The reversal of 688735742 is 247537886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688735741) 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, 101513 + ... + 108084.

It is an arithmetic number, because the mean of its divisors is an integer number (67909752).

Almost surely, 2^688735742 is an apocalyptic number.

688735742 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

688735742 is a deficient number, since it is larger than the sum of its proper divisors (397820290).

688735742 is a wasteful number, since it uses less digits than its factorization.

688735742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209683.

The product of its digits is 2257920, while the sum is 50.

The square root of 688735742 is about 26243.7753000593. The cubic root of 688735742 is about 883.1155672834.

The spelling of 688735742 in words is "six hundred eighty-eight million, seven hundred thirty-five thousand, seven hundred forty-two".