51219448 has 32 divisors (see below), whose sum is σ = 109992960. Its totient is φ = 21903840.

The previous prime is 51219437. The next prime is 51219449. The reversal of 51219448 is 84491215.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51219449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40993 + ... + 42223.

It is an arithmetic number, because the mean of its divisors is an integer number (3437280).

Almost surely, 2^51219448 is an apocalyptic number.

It is an amenable number.

51219448 is an abundant number, since it is smaller than the sum of its proper divisors (58773512).

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

51219448 is a wasteful number, since it uses less digits than its factorization.

51219448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987 (or 1983 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 51219448 is about 7156.7763692881. The cubic root of 51219448 is about 371.3741161643.

The spelling of 51219448 in words is "fifty-one million, two hundred nineteen thousand, four hundred forty-eight".