51620012 has 6 divisors (see below), whose sum is σ = 90335028. Its totient is φ = 25810004.

The previous prime is 51620011. The next prime is 51620021. The reversal of 51620012 is 21002615.

It is not an unprimeable number, because it can be changed into a prime (51620011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452498 + ... + 6452505.

It is an arithmetic number, because the mean of its divisors is an integer number (15055838).

Almost surely, 2^51620012 is an apocalyptic number.

It is an amenable number.

51620012 is a deficient number, since it is larger than the sum of its proper divisors (38715016).

51620012 is a wasteful number, since it uses less digits than its factorization.

51620012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905007 (or 12905005 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51620012 is about 7184.7068137816. The cubic root of 51620012 is about 372.3397193416.

Adding to 51620012 its reverse (21002615), we get a palindrome (72622627).

The spelling of 51620012 in words is "fifty-one million, six hundred twenty thousand, twelve".