51879905 has 16 divisors (see below), whose sum is σ = 77618304. Its totient is φ = 32340480.

The previous prime is 51879889. The next prime is 51879911. The reversal of 51879905 is 50997815.

It is a happy number.

It is not a de Polignac number, because 51879905 - 2⁴ = 51879889 is a prime.

It is a Duffinian number.

It is a Curzon 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, 66992 + ... + 67761.

It is an arithmetic number, because the mean of its divisors is an integer number (4851144).

Almost surely, 2^51879905 is an apocalyptic number.

51879905 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51879905 is a deficient number, since it is larger than the sum of its proper divisors (25738399).

51879905 is a wasteful number, since it uses less digits than its factorization.

51879905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134776.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 51879905 is about 7202.7706474662. The cubic root of 51879905 is about 372.9635506458.

The spelling of 51879905 in words is "fifty-one million, eight hundred seventy-nine thousand, nine hundred five".