51620976 has 240 divisors, whose sum is σ = 175488768. Its totient is φ = 14515200.

The previous prime is 51620971. The next prime is 51620977. The reversal of 51620976 is 67902615.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51620976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 727021 + ... + 727091.

Almost surely, 2^51620976 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 51620976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87744384).

51620976 is an abundant number, since it is smaller than the sum of its proper divisors (123867792).

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

51620976 is a wasteful number, since it uses less digits than its factorization.

51620976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 51620976 is about 7184.7739004091. The cubic root of 51620976 is about 372.3420371329.

The spelling of 51620976 in words is "fifty-one million, six hundred twenty thousand, nine hundred seventy-six".