690105844 has 12 divisors (see below), whose sum is σ = 1207869124. Its totient is φ = 345000384.

The previous prime is 690105827. The next prime is 690105847. The reversal of 690105844 is 448501096.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 544662244 + 145443600 = 23338^2 + 12060^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690105847) 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, 45784 + ... + 58960.

Almost surely, 2^690105844 is an apocalyptic number.

It is an amenable number.

690105844 is a deficient number, since it is larger than the sum of its proper divisors (517763280).

690105844 is a wasteful number, since it uses less digits than its factorization.

690105844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26274 (or 26272 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 690105844 is about 26269.8657019788. The cubic root of 690105844 is about 883.7007733324.

The spelling of 690105844 in words is "six hundred ninety million, one hundred five thousand, eight hundred forty-four".