51209776 has 40 divisors (see below), whose sum is σ = 106359264. Its totient is φ = 23823360.

The previous prime is 51209759. The next prime is 51209783. The reversal of 51209776 is 67790215.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 7 ways as a sum of consecutive naturals, for example, 11736 + ... + 15496.

Almost surely, 2^51209776 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 51209776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53179632).

51209776 is an abundant number, since it is smaller than the sum of its proper divisors (55149488).

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

51209776 is a wasteful number, since it uses less digits than its factorization.

51209776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829 (or 3823 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 51209776 is about 7156.1006141613. The cubic root of 51209776 is about 371.3507386082.

The spelling of 51209776 in words is "fifty-one million, two hundred nine thousand, seven hundred seventy-six".