51278395 has 8 divisors (see below), whose sum is σ = 70324704. Its totient is φ = 35162304.

The previous prime is 51278393. The next prime is 51278399. The reversal of 51278395 is 59387215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51278395 - 2¹ = 51278393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51278393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732514 + ... + 732583.

It is an arithmetic number, because the mean of its divisors is an integer number (8790588).

Almost surely, 2^51278395 is an apocalyptic number.

51278395 is a deficient number, since it is larger than the sum of its proper divisors (19046309).

51278395 is a wasteful number, since it uses less digits than its factorization.

51278395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465109.

The product of its digits is 75600, while the sum is 40.

The square root of 51278395 is about 7160.8934498427. The cubic root of 51278395 is about 371.5165295001.

The spelling of 51278395 in words is "fifty-one million, two hundred seventy-eight thousand, three hundred ninety-five".