551136720 has 80 divisors (see below), whose sum is σ = 1710783360. Its totient is φ = 146775552.

The previous prime is 551136713. The next prime is 551136721. The reversal of 551136720 is 27631155.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551136721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342157 + ... + 343763.

It is an arithmetic number, because the mean of its divisors is an integer number (21384792).

Almost surely, 2^551136720 is an apocalyptic number.

It is an amenable number.

551136720 is an abundant number, since it is smaller than the sum of its proper divisors (1159646640).

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

551136720 is a wasteful number, since it uses less digits than its factorization.

551136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 551136720 is about 23476.3012418907. The cubic root of 551136720 is about 819.8853299893.

Adding to 551136720 its reverse (27631155), we get a palindrome (578767875).

The spelling of 551136720 in words is "five hundred fifty-one million, one hundred thirty-six thousand, seven hundred twenty".