51549680 has 160 divisors (see below), whose sum is σ = 151073664. Its totient is φ = 15925248.

The previous prime is 51549653. The next prime is 51549689. The reversal of 51549680 is 8694515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51549689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 531392 + ... + 531488.

Almost surely, 2^51549680 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 51549680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75536832).

51549680 is an abundant number, since it is smaller than the sum of its proper divisors (99523984).

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

51549680 is a wasteful number, since it uses less digits than its factorization.

51549680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 51549680 is about 7179.8105824597. The cubic root of 51549680 is about 372.1705388336.

The spelling of 51549680 in words is "fifty-one million, five hundred forty-nine thousand, six hundred eighty".