51428405 has 16 divisors (see below), whose sum is σ = 70734720. Its totient is φ = 35163072.

The previous prime is 51428401. The next prime is 51428407. The reversal of 51428405 is 50482415.

It is not a de Polignac number, because 51428405 - 2² = 51428401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51428401) 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, 11327 + ... + 15203.

It is an arithmetic number, because the mean of its divisors is an integer number (4420920).

Almost surely, 2^51428405 is an apocalyptic number.

It is an amenable number.

51428405 is a deficient number, since it is larger than the sum of its proper divisors (19306315).

51428405 is a wasteful number, since it uses less digits than its factorization.

51428405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 51428405 is about 7171.3600523192. The cubic root of 51428405 is about 371.8784553971.

The spelling of 51428405 in words is "fifty-one million, four hundred twenty-eight thousand, four hundred five".