690666054 has 16 divisors (see below), whose sum is σ = 1487588592. Its totient is φ = 212512608.

The previous prime is 690666047. The next prime is 690666127. The reversal of 690666054 is 450666096.

It is a junction number, because it is equal to n+sod(n) for n = 690665997 and 690666015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4427269 + ... + 4427424.

It is an arithmetic number, because the mean of its divisors is an integer number (92974287).

Almost surely, 2^690666054 is an apocalyptic number.

690666054 is an abundant number, since it is smaller than the sum of its proper divisors (796922538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690666054 is a wasteful number, since it uses less digits than its factorization.

690666054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854711.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 690666054 is about 26280.5261362858. The cubic root of 690666054 is about 883.9398304357.

Adding to 690666054 its sum of digits (42), we get a palindrome (690666096).

The spelling of 690666054 in words is "six hundred ninety million, six hundred sixty-six thousand, fifty-four".