688862641 has 4 divisors (see below), whose sum is σ = 688916592. Its totient is φ = 688808692.

The previous prime is 688862621. The next prime is 688862653. The reversal of 688862641 is 146268886.

688862641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 688862641 - 2¹¹ = 688860593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688862621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4146 + ... + 37348.

It is an arithmetic number, because the mean of its divisors is an integer number (172229148).

Almost surely, 2^688862641 is an apocalyptic number.

It is an amenable number.

688862641 is a deficient number, since it is larger than the sum of its proper divisors (53951).

688862641 is a wasteful number, since it uses less digits than its factorization.

688862641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53950.

The product of its digits is 884736, while the sum is 49.

The square root of 688862641 is about 26246.1928858263. The cubic root of 688862641 is about 883.1698017276.

The spelling of 688862641 in words is "six hundred eighty-eight million, eight hundred sixty-two thousand, six hundred forty-one".