687539970 has 96 divisors (see below), whose sum is σ = 1966228992. Its totient is φ = 165626496.

The previous prime is 687539969. The next prime is 687539981. The reversal of 687539970 is 79935786.

It is a super-2 number, since 2×687539970² = 945422420695201800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48739 + ... + 61241.

It is an arithmetic number, because the mean of its divisors is an integer number (20481552).

Almost surely, 2^687539970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687539970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (983114496).

687539970 is an abundant number, since it is smaller than the sum of its proper divisors (1278689022).

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

687539970 is a wasteful number, since it uses less digits than its factorization.

687539970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12576 (or 12573 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 687539970 is about 26220.9833911698. The cubic root of 687539970 is about 882.6041875028.

The spelling of 687539970 in words is "six hundred eighty-seven million, five hundred thirty-nine thousand, nine hundred seventy".