51428906 has 4 divisors (see below), whose sum is σ = 77143362. Its totient is φ = 25714452.

The previous prime is 51428879. The next prime is 51428911. The reversal of 51428906 is 60982415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34281025 + 17147881 = 5855^2 + 4141^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12857225 + ... + 12857228.

Almost surely, 2^51428906 is an apocalyptic number.

51428906 is a deficient number, since it is larger than the sum of its proper divisors (25714456).

51428906 is a wasteful number, since it uses less digits than its factorization.

51428906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25714455.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 51428906 is about 7171.3949828468. The cubic root of 51428906 is about 371.8796629691.

The spelling of 51428906 in words is "fifty-one million, four hundred twenty-eight thousand, nine hundred six".