51777216 has 42 divisors (see below), whose sum is σ = 148411692. Its totient is φ = 17258880.

The previous prime is 51777211. The next prime is 51777233. The reversal of 51777216 is 61277715.

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

It is not an unprimeable number, because it can be changed into a prime (51777211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44370 + ... + 45521.

Almost surely, 2^51777216 is an apocalyptic number.

It is an amenable number.

51777216 is an abundant number, since it is smaller than the sum of its proper divisors (96634476).

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

51777216 is a wasteful number, since it uses less digits than its factorization.

51777216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89909 (or 89896 counting only the distinct ones).

The product of its digits is 20580, while the sum is 36.

The square root of 51777216 is about 7195.6386790889. The cubic root of 51777216 is about 372.7173117523.

The spelling of 51777216 in words is "fifty-one million, seven hundred seventy-seven thousand, two hundred sixteen".