51326620 has 24 divisors (see below), whose sum is σ = 109555488. Its totient is φ = 20193600.

The previous prime is 51326609. The next prime is 51326633. The reversal of 51326620 is 2662315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19816 + ... + 22255.

It is an arithmetic number, because the mean of its divisors is an integer number (4564812).

Almost surely, 2^51326620 is an apocalyptic number.

It is an amenable number.

51326620 is an abundant number, since it is smaller than the sum of its proper divisors (58228868).

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

51326620 is a wasteful number, since it uses less digits than its factorization.

51326620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42141 (or 42139 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 51326620 is about 7164.2599059498. The cubic root of 51326620 is about 371.6329578130.

Adding to 51326620 its reverse (2662315), we get a palindrome (53988935).

The spelling of 51326620 in words is "fifty-one million, three hundred twenty-six thousand, six hundred twenty".