690733887 has 8 divisors (see below), whose sum is σ = 934724736. Its totient is φ = 453616152.

The previous prime is 690733873. The next prime is 690733889. The reversal of 690733887 is 788337096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690733887 - 2¹⁵ = 690701119 is a prime.

It is a super-2 number, since 2×690733887² = 954226605300257538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690733889) 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 7 ways as a sum of consecutive naturals, for example, 1718043 + ... + 1718444.

It is an arithmetic number, because the mean of its divisors is an integer number (116840592).

Almost surely, 2^690733887 is an apocalyptic number.

690733887 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

690733887 is a deficient number, since it is larger than the sum of its proper divisors (243990849).

690733887 is a wasteful number, since it uses less digits than its factorization.

690733887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436557.

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

The square root of 690733887 is about 26281.8166609540. The cubic root of 690733887 is about 883.9687678782.

The spelling of 690733887 in words is "six hundred ninety million, seven hundred thirty-three thousand, eight hundred eighty-seven".