51277940 has 48 divisors (see below), whose sum is σ = 125701632. Its totient is φ = 17204736.

The previous prime is 51277883. The next prime is 51277957. The reversal of 51277940 is 4977215.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51277940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2684 + ... + 10476.

It is an arithmetic number, because the mean of its divisors is an integer number (2618784).

Almost surely, 2^51277940 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 51277940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62850816).

51277940 is an abundant number, since it is smaller than the sum of its proper divisors (74423692).

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

51277940 is a wasteful number, since it uses less digits than its factorization.

51277940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7856 (or 7854 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 51277940 is about 7160.8616799935. The cubic root of 51277940 is about 371.5154306583.

The spelling of 51277940 in words is "fifty-one million, two hundred seventy-seven thousand, nine hundred forty".