690109856 has 12 divisors (see below), whose sum is σ = 1358653842. Its totient is φ = 345054912.

The previous prime is 690109853. The next prime is 690109859. The reversal of 690109856 is 658901096.

It is an interprime number because it is at equal distance from previous prime (690109853) and next prime (690109859).

It can be written as a sum of positive squares in only one way, i.e., 619213456 + 70896400 = 24884^2 + 8420^2 .

It is a super-2 number, since 2×690109856² = 952503226696681472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (690109853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10782935 + ... + 10782998.

Almost surely, 2^690109856 is an apocalyptic number.

It is an amenable number.

690109856 is a deficient number, since it is larger than the sum of its proper divisors (668543986).

690109856 is a wasteful number, since it uses less digits than its factorization.

690109856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21565943 (or 21565935 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 690109856 is about 26269.9420631261. The cubic root of 690109856 is about 883.7024858236.

The spelling of 690109856 in words is "six hundred ninety million, one hundred nine thousand, eight hundred fifty-six".