51145480 has 16 divisors (see below), whose sum is σ = 115077420. Its totient is φ = 20458176.

The previous prime is 51145463. The next prime is 51145499. The reversal of 51145480 is 8454115.

It can be written as a sum of positive squares in 2 ways, for example, as 50381604 + 763876 = 7098^2 + 874^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639279 + ... + 639358.

Almost surely, 2^51145480 is an apocalyptic number.

It is an amenable number.

51145480 is an abundant number, since it is smaller than the sum of its proper divisors (63931940).

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

51145480 is a wasteful number, since it uses less digits than its factorization.

51145480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278648 (or 1278644 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 51145480 is about 7151.6068124583. The cubic root of 51145480 is about 371.1952580956.

Adding to 51145480 its reverse (8454115), we get a palindrome (59599595).

The spelling of 51145480 in words is "fifty-one million, one hundred forty-five thousand, four hundred eighty".