51672393 has 12 divisors (see below), whose sum is σ = 75661300. Its totient is φ = 33975936.

The previous prime is 51672391. The next prime is 51672407. The reversal of 51672393 is 39327615.

It can be written as a sum of positive squares in 2 ways, for example, as 20903184 + 30769209 = 4572^2 + 5547^2 .

It is not a de Polignac number, because 51672393 - 2¹ = 51672391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51672391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38668 + ... + 39981.

Almost surely, 2^51672393 is an apocalyptic number.

It is an amenable number.

51672393 is a deficient number, since it is larger than the sum of its proper divisors (23988907).

51672393 is a wasteful number, since it uses less digits than its factorization.

51672393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78728 (or 78725 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 51672393 is about 7188.3512017708. The cubic root of 51672393 is about 372.4656196968.

The spelling of 51672393 in words is "fifty-one million, six hundred seventy-two thousand, three hundred ninety-three".