51505470 has 40 divisors (see below), whose sum is σ = 138494664. Its totient is φ = 13734576.

The previous prime is 51505423. The next prime is 51505481. The reversal of 51505470 is 7450515.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30984 + ... + 32603.

Almost surely, 2^51505470 is an apocalyptic number.

51505470 is an abundant number, since it is smaller than the sum of its proper divisors (86989194).

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

51505470 is a wasteful number, since it uses less digits than its factorization.

51505470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63606 (or 63597 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 51505470 is about 7176.7311500432. The cubic root of 51505470 is about 372.0641148596.

Adding to 51505470 its reverse (7450515), we get a palindrome (58955985).

It can be divided in two parts, 51 and 505470, that added together give a square (505521 = 711²).

The spelling of 51505470 in words is "fifty-one million, five hundred five thousand, four hundred seventy".