669729948 has 12 divisors (see below), whose sum is σ = 1562703240. Its totient is φ = 223243312.

The previous prime is 669729941. The next prime is 669729967. The reversal of 669729948 is 849927966.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 669729891 and 669729900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669729941) 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, 27905403 + ... + 27905426.

It is an arithmetic number, because the mean of its divisors is an integer number (130225270).

Almost surely, 2^669729948 is an apocalyptic number.

It is an amenable number.

669729948 is an abundant number, since it is smaller than the sum of its proper divisors (892973292).

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

669729948 is a wasteful number, since it uses less digits than its factorization.

669729948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55810836 (or 55810834 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 60.

The square root of 669729948 is about 25879.1411758582. The cubic root of 669729948 is about 874.9164319646.

The spelling of 669729948 in words is "six hundred sixty-nine million, seven hundred twenty-nine thousand, nine hundred forty-eight".