551423730 has 128 divisors (see below), whose sum is σ = 1646459136. Its totient is φ = 116121600.

The previous prime is 551423723. The next prime is 551423731. The reversal of 551423730 is 37324155.

551423730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×551423730² = 608136260014225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (551423731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69150 + ... + 76710.

It is an arithmetic number, because the mean of its divisors is an integer number (12862962).

Almost surely, 2^551423730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551423730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823229568).

551423730 is an abundant number, since it is smaller than the sum of its proper divisors (1095035406).

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

551423730 is a wasteful number, since it uses less digits than its factorization.

551423730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7612.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 551423730 is about 23482.4132064828. The cubic root of 551423730 is about 820.0276264736.

Adding to 551423730 its reverse (37324155), we get a palindrome (588747885).

The spelling of 551423730 in words is "five hundred fifty-one million, four hundred twenty-three thousand, seven hundred thirty".