51087490 has 8 divisors (see below), whose sum is σ = 91957500. Its totient is φ = 20434992.

The previous prime is 51087469. The next prime is 51087497. The reversal of 51087490 is 9478015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50253921 + 833569 = 7089^2 + 913^2 .

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 (51087497) 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, 2554365 + ... + 2554384.

Almost surely, 2^51087490 is an apocalyptic number.

51087490 is a deficient number, since it is larger than the sum of its proper divisors (40870010).

51087490 is a wasteful number, since it uses less digits than its factorization.

51087490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108756.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51087490 is about 7147.5513289518. The cubic root of 51087490 is about 371.0549149440.

The spelling of 51087490 in words is "fifty-one million, eighty-seven thousand, four hundred ninety".