51497780 has 12 divisors (see below), whose sum is σ = 108145380. Its totient is φ = 20599104.

The previous prime is 51497729. The next prime is 51497783. The reversal of 51497780 is 8779415.

It can be written as a sum of positive squares in 2 ways, for example, as 22316176 + 29181604 = 4724^2 + 5402^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51497783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287425 + ... + 1287464.

It is an arithmetic number, because the mean of its divisors is an integer number (9012115).

Almost surely, 2^51497780 is an apocalyptic number.

It is an amenable number.

51497780 is an abundant number, since it is smaller than the sum of its proper divisors (56647600).

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

51497780 is a wasteful number, since it uses less digits than its factorization.

51497780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574898 (or 2574896 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 51497780 is about 7176.1953708076. The cubic root of 51497780 is about 372.0455969853.

The spelling of 51497780 in words is "fifty-one million, four hundred ninety-seven thousand, seven hundred eighty".