51007700 has 18 divisors (see below), whose sum is σ = 110686926. Its totient is φ = 20403040.

The previous prime is 51007699. The next prime is 51007709. The reversal of 51007700 is 770015.

It can be written as a sum of positive squares in 3 ways, for example, as 12716356 + 38291344 = 3566^2 + 6188^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51007709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 254939 + ... + 255138.

Almost surely, 2^51007700 is an apocalyptic number.

51007700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51007700 is an abundant number, since it is smaller than the sum of its proper divisors (59679226).

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

51007700 is a wasteful number, since it uses less digits than its factorization.

51007700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510091 (or 510084 counting only the distinct ones).

The product of its (nonzero) digits is 245, while the sum is 20.

The square root of 51007700 is about 7141.9675160281. The cubic root of 51007700 is about 370.8616393268.

Adding to 51007700 its reverse (770015), we get a palindrome (51777715).

The spelling of 51007700 in words is "fifty-one million, seven thousand, seven hundred".