51087394 has 8 divisors (see below), whose sum is σ = 78500268. Its totient is φ = 24920640.

The previous prime is 51087391. The next prime is 51087427. The reversal of 51087394 is 49378015.

It can be written as a sum of positive squares in 2 ways, for example, as 33489369 + 17598025 = 5787^2 + 4195^2 .

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

It is a super-2 number, since 2×51087394² = 5219843651422472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51087391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311427 + ... + 311590.

Almost surely, 2^51087394 is an apocalyptic number.

51087394 is a deficient number, since it is larger than the sum of its proper divisors (27412874).

51087394 is a wasteful number, since it uses less digits than its factorization.

51087394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623060.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 51087394 is about 7147.5446133620. The cubic root of 51087394 is about 371.0546825238.

The spelling of 51087394 in words is "fifty-one million, eighty-seven thousand, three hundred ninety-four".