51093280 has 144 divisors (see below), whose sum is σ = 148236480. Its totient is φ = 16595712.

The previous prime is 51093269. The next prime is 51093283. The reversal of 51093280 is 8239015.

It is a super-2 number, since 2×51093280² = 5221046522316800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51093283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2689111 + ... + 2689129.

It is an arithmetic number, because the mean of its divisors is an integer number (1029420).

Almost surely, 2^51093280 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 51093280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74118240).

51093280 is an abundant number, since it is smaller than the sum of its proper divisors (97143200).

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

51093280 is an frugal number, since it uses more digits than its factorization.

51093280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51093280 is about 7147.9563512937. The cubic root of 51093280 is about 371.0689322491.

The spelling of 51093280 in words is "fifty-one million, ninety-three thousand, two hundred eighty".