687364791 has 32 divisors (see below), whose sum is σ = 998205120. Its totient is φ = 419088384.

The previous prime is 687364789. The next prime is 687364793. The reversal of 687364791 is 197463786.

It is an interprime number because it is at equal distance from previous prime (687364789) and next prime (687364793).

It is not a de Polignac number, because 687364791 - 2¹ = 687364789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687364793) 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 31 ways as a sum of consecutive naturals, for example, 293461 + ... + 295793.

It is an arithmetic number, because the mean of its divisors is an integer number (31193910).

Almost surely, 2^687364791 is an apocalyptic number.

687364791 is a deficient number, since it is larger than the sum of its proper divisors (310840329).

687364791 is a wasteful number, since it uses less digits than its factorization.

687364791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515.

The product of its digits is 1524096, while the sum is 51.

The square root of 687364791 is about 26217.6427430080. The cubic root of 687364791 is about 882.5292212662.

The spelling of 687364791 in words is "six hundred eighty-seven million, three hundred sixty-four thousand, seven hundred ninety-one".