687927970 has 16 divisors (see below), whose sum is σ = 1238990328. Its totient is φ = 275011200.

The previous prime is 687927949. The next prime is 687927979. The reversal of 687927970 is 79729786.

It can be written as a sum of positive squares in 4 ways, for example, as 366837409 + 321090561 = 19153^2 + 17919^2 .

It is not an unprimeable number, because it can be changed into a prime (687927979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089 + ... + 37108.

Almost surely, 2^687927970 is an apocalyptic number.

687927970 is a deficient number, since it is larger than the sum of its proper divisors (551062358).

687927970 is a wasteful number, since it uses less digits than its factorization.

687927970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40005.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The square root of 687927970 is about 26228.3810022655. The cubic root of 687927970 is about 882.7701831983.

The spelling of 687927970 in words is "six hundred eighty-seven million, nine hundred twenty-seven thousand, nine hundred seventy".