687070993 has 6 divisors (see below), whose sum is σ = 799245906. Its totient is φ = 588917952.

The previous prime is 687070991. The next prime is 687071009. The reversal of 687070993 is 399070786.

It can be written as a sum of positive squares in only one way, i.e., 403889409 + 283181584 = 20097^2 + 16828^2 .

It is not a de Polignac number, because 687070993 - 2¹ = 687070991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 14021857 = 687070993 / (6 + 8 + 7 + 0 + 7 + 0 + 9 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687070991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7010880 + ... + 7010977.

It is an arithmetic number, because the mean of its divisors is an integer number (133207651).

Almost surely, 2^687070993 is an apocalyptic number.

It is an amenable number.

687070993 is a deficient number, since it is larger than the sum of its proper divisors (112174913).

687070993 is a wasteful number, since it uses less digits than its factorization.

687070993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14021871 (or 14021864 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 687070993 is about 26212.0390851227. The cubic root of 687070993 is about 882.4034645239.

The spelling of 687070993 in words is "six hundred eighty-seven million, seventy thousand, nine hundred ninety-three".