51020388 has 24 divisors (see below), whose sum is σ = 132275360. Its totient is φ = 17006760.

The previous prime is 51020369. The next prime is 51020399. The reversal of 51020388 is 88302015.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236098 + ... + 236313.

Almost surely, 2^51020388 is an apocalyptic number.

It is an amenable number.

51020388 is an abundant number, since it is smaller than the sum of its proper divisors (81254972).

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

51020388 is a wasteful number, since it uses less digits than its factorization.

51020388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472424 (or 472416 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51020388 is about 7142.8557314284. The cubic root of 51020388 is about 370.8923869876.

The spelling of 51020388 in words is "fifty-one million, twenty thousand, three hundred eighty-eight".