687429387 has 12 divisors (see below), whose sum is σ = 993200520. Its totient is φ = 458172288.

The previous prime is 687429383. The next prime is 687429403. The reversal of 687429387 is 783924786.

It is not a de Polignac number, because 687429387 - 2² = 687429383 is a prime.

It is a super-2 number, since 2×687429387² = 945118324222391538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687429383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45403 + ... + 58619.

It is an arithmetic number, because the mean of its divisors is an integer number (82766710).

Almost surely, 2^687429387 is an apocalyptic number.

687429387 is a deficient number, since it is larger than the sum of its proper divisors (305771133).

687429387 is a wasteful number, since it uses less digits than its factorization.

687429387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19002 (or 18999 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 687429387 is about 26218.8746326001. The cubic root of 687429387 is about 882.5568660106.

The spelling of 687429387 in words is "six hundred eighty-seven million, four hundred twenty-nine thousand, three hundred eighty-seven".