51002720 has 72 divisors (see below), whose sum is σ = 128114784. Its totient is φ = 19183616.

The previous prime is 51002711. The next prime is 51002741. The reversal of 51002720 is 2720015.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45689 + ... + 46791.

It is an arithmetic number, because the mean of its divisors is an integer number (1779372).

Almost surely, 2^51002720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51002720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64057392).

51002720 is an abundant number, since it is smaller than the sum of its proper divisors (77112064).

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

51002720 is a wasteful number, since it uses less digits than its factorization.

51002720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 51002720 is about 7141.6188640952. The cubic root of 51002720 is about 370.8495695735.

Adding to 51002720 its reverse (2720015), we get a palindrome (53722735).

The spelling of 51002720 in words is "fifty-one million, two thousand, seven hundred twenty".