51240030 has 32 divisors (see below), whose sum is σ = 123181344. Its totient is φ = 13641216.

The previous prime is 51240019. The next prime is 51240073. The reversal of 51240030 is 3004215.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 51239991 and 51240009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24714 + ... + 26706.

It is an arithmetic number, because the mean of its divisors is an integer number (3849417).

Almost surely, 2^51240030 is an apocalyptic number.

51240030 is an abundant number, since it is smaller than the sum of its proper divisors (71941314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51240030 is a wasteful number, since it uses less digits than its factorization.

51240030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 51240030 is about 7158.2141627643. The cubic root of 51240030 is about 371.4238537721.

Adding to 51240030 its reverse (3004215), we get a palindrome (54244245).

The spelling of 51240030 in words is "fifty-one million, two hundred forty thousand, thirty".