551979644 has 12 divisors (see below), whose sum is σ = 966500304. Its totient is φ = 275836704.

The previous prime is 551979643. The next prime is 551979671. The reversal of 551979644 is 446979155.

It is a junction number, because it is equal to n+sod(n) for n = 551979592 and 551979601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551979641) 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, 29969 + ... + 44744.

It is an arithmetic number, because the mean of its divisors is an integer number (80541692).

Almost surely, 2^551979644 is an apocalyptic number.

It is an amenable number.

551979644 is a deficient number, since it is larger than the sum of its proper divisors (414520660).

551979644 is a wasteful number, since it uses less digits than its factorization.

551979644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76564 (or 76562 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 50.

The square root of 551979644 is about 23494.2470404991. The cubic root of 551979644 is about 820.3031023049.

The spelling of 551979644 in words is "five hundred fifty-one million, nine hundred seventy-nine thousand, six hundred forty-four".