51777880 has 64 divisors (see below), whose sum is σ = 145255680. Its totient is φ = 16137600.

The previous prime is 51777877. The next prime is 51777883. The reversal of 51777880 is 8877715.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51777877) and next prime (51777883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51777883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5326 + ... + 11485.

It is an arithmetic number, because the mean of its divisors is an integer number (2269620).

Almost surely, 2^51777880 is an apocalyptic number.

It is an amenable number.

51777880 is an abundant number, since it is smaller than the sum of its proper divisors (93477800).

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

51777880 is a wasteful number, since it uses less digits than its factorization.

51777880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16840 (or 16836 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 51777880 is about 7195.6848180003. The cubic root of 51777880 is about 372.7189050093.

The spelling of 51777880 in words is "fifty-one million, seven hundred seventy-seven thousand, eight hundred eighty".