51126780 has 48 divisors (see below), whose sum is σ = 143708544. Its totient is φ = 13581120.

The previous prime is 51126773. The next prime is 51126787. The reversal of 51126780 is 8762115.

It is an interprime number because it is at equal distance from previous prime (51126773) and next prime (51126787).

It is a super-2 number, since 2×51126780² = 5227895266336800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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 (51126787) 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, 15475 + ... + 18485.

It is an arithmetic number, because the mean of its divisors is an integer number (2993928).

Almost surely, 2^51126780 is an apocalyptic number.

It is an amenable number.

51126780 is an abundant number, since it is smaller than the sum of its proper divisors (92581764).

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

51126780 is a wasteful number, since it uses less digits than its factorization.

51126780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306 (or 3304 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 51126780 is about 7150.2992944352. The cubic root of 51126780 is about 371.1500133189.

Adding to 51126780 its reverse (8762115), we get a palindrome (59888895).

The spelling of 51126780 in words is "fifty-one million, one hundred twenty-six thousand, seven hundred eighty".