51428819 has 8 divisors (see below), whose sum is σ = 55718880. Its totient is φ = 47186496.

The previous prime is 51428809. The next prime is 51428833. The reversal of 51428819 is 91882415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51428819 is a prime.

It is a super-2 number, since 2×51428819² = 5289846847469522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51428809) 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, 9674 + ... + 14015.

It is an arithmetic number, because the mean of its divisors is an integer number (6964860).

Almost surely, 2^51428819 is an apocalyptic number.

51428819 is a deficient number, since it is larger than the sum of its proper divisors (4290061).

51428819 is a wasteful number, since it uses less digits than its factorization.

51428819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23869.

The product of its digits is 23040, while the sum is 38.

The square root of 51428819 is about 7171.3889170788. The cubic root of 51428819 is about 371.8794532715.

The spelling of 51428819 in words is "fifty-one million, four hundred twenty-eight thousand, eight hundred nineteen".