51749980 has 12 divisors (see below), whose sum is σ = 108675000. Its totient is φ = 20699984.

The previous prime is 51749963. The next prime is 51749987. The reversal of 51749980 is 8994715.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51749987) 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, 1293730 + ... + 1293769.

It is an arithmetic number, because the mean of its divisors is an integer number (9056250).

Almost surely, 2^51749980 is an apocalyptic number.

It is an amenable number.

51749980 is an abundant number, since it is smaller than the sum of its proper divisors (56925020).

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

51749980 is a wasteful number, since it uses less digits than its factorization.

51749980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587508 (or 2587506 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 51749980 is about 7193.7458948729. The cubic root of 51749980 is about 372.6519476793.

The spelling of 51749980 in words is "fifty-one million, seven hundred forty-nine thousand, nine hundred eighty".