51168240 has 80 divisors (see below), whose sum is σ = 176253600. Its totient is φ = 13644288.

The previous prime is 51168233. The next prime is 51168251. The reversal of 51168240 is 4286115.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

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, 9685 + ... + 14004.

It is an arithmetic number, because the mean of its divisors is an integer number (2203170).

Almost surely, 2^51168240 is an apocalyptic number.

It is an amenable number.

51168240 is an abundant number, since it is smaller than the sum of its proper divisors (125085360).

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

51168240 is a wasteful number, since it uses less digits than its factorization.

51168240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23711 (or 23699 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51168240 is about 7153.1978862604. The cubic root of 51168240 is about 371.2503111925.

The spelling of 51168240 in words is "fifty-one million, one hundred sixty-eight thousand, two hundred forty".