51678212 has 6 divisors (see below), whose sum is σ = 90436878. Its totient is φ = 25839104.

The previous prime is 51678197. The next prime is 51678223. The reversal of 51678212 is 21287615.

It can be written as a sum of positive squares in only one way, i.e., 48636676 + 3041536 = 6974^2 + 1744^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459773 + ... + 6459780.

It is an arithmetic number, because the mean of its divisors is an integer number (15072813).

Almost surely, 2^51678212 is an apocalyptic number.

It is an amenable number.

51678212 is a deficient number, since it is larger than the sum of its proper divisors (38758666).

51678212 is a wasteful number, since it uses less digits than its factorization.

51678212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12919557 (or 12919555 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 51678212 is about 7188.7559424423. The cubic root of 51678212 is about 372.4796007026.

The spelling of 51678212 in words is "fifty-one million, six hundred seventy-eight thousand, two hundred twelve".