690445867 has 4 divisors (see below), whose sum is σ = 691230456. Its totient is φ = 689661280.

The previous prime is 690445853. The next prime is 690445913. The reversal of 690445867 is 768544096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690445867 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 690445867.

It is not an unprimeable number, because it can be changed into a prime (690445267) 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, 390973 + ... + 392734.

It is an arithmetic number, because the mean of its divisors is an integer number (172807614).

Almost surely, 2^690445867 is an apocalyptic number.

690445867 is a deficient number, since it is larger than the sum of its proper divisors (784589).

690445867 is an equidigital number, since it uses as much as digits as its factorization.

690445867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784588.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 690445867 is about 26276.3366358402. The cubic root of 690445867 is about 883.8458859768.

The spelling of 690445867 in words is "six hundred ninety million, four hundred forty-five thousand, eight hundred sixty-seven".