551279820 has 192 divisors, whose sum is σ = 1961680896. Its totient is φ = 112527360.

The previous prime is 551279803. The next prime is 551279831. The reversal of 551279820 is 28972155.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 167632 + ... + 170888.

It is an arithmetic number, because the mean of its divisors is an integer number (10217088).

Almost surely, 2^551279820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551279820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980840448).

551279820 is an abundant number, since it is smaller than the sum of its proper divisors (1410401076).

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

551279820 is a wasteful number, since it uses less digits than its factorization.

551279820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320 (or 3318 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 551279820 is about 23479.3487984654. The cubic root of 551279820 is about 819.9562836103.

The spelling of 551279820 in words is "five hundred fifty-one million, two hundred seventy-nine thousand, eight hundred twenty".