51672778 has 8 divisors (see below), whose sum is σ = 77639940. Its totient is φ = 25792800.

The previous prime is 51672769. The next prime is 51672779. The reversal of 51672778 is 87727615.

51672778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 50225569 + 1447209 = 7087^2 + 1203^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51672779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20293 + ... + 22696.

Almost surely, 2^51672778 is an apocalyptic number.

51672778 is a deficient number, since it is larger than the sum of its proper divisors (25967162).

51672778 is a wasteful number, since it uses less digits than its factorization.

51672778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43592.

The product of its digits is 164640, while the sum is 43.

The square root of 51672778 is about 7188.3779811582. The cubic root of 51672778 is about 372.4665447485.

The spelling of 51672778 in words is "fifty-one million, six hundred seventy-two thousand, seven hundred seventy-eight".