51077820 has 24 divisors (see below), whose sum is σ = 143018064. Its totient is φ = 13620736.

The previous prime is 51077813. The next prime is 51077827. The reversal of 51077820 is 2877015.

It is a happy number.

51077820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51077813) and next prime (51077827).

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 (51077827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425589 + ... + 425708.

It is an arithmetic number, because the mean of its divisors is an integer number (5959086).

Almost surely, 2^51077820 is an apocalyptic number.

It is an amenable number.

51077820 is an abundant number, since it is smaller than the sum of its proper divisors (91940244).

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

51077820 is a wasteful number, since it uses less digits than its factorization.

51077820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851309 (or 851307 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 51077820 is about 7146.8748414954. The cubic root of 51077820 is about 371.0315019882.

The spelling of 51077820 in words is "fifty-one million, seventy-seven thousand, eight hundred twenty".