51620444 has 6 divisors (see below), whose sum is σ = 90335784. Its totient is φ = 25810220.

The previous prime is 51620431. The next prime is 51620461. The reversal of 51620444 is 44402615.

51620444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452552 + ... + 6452559.

It is an arithmetic number, because the mean of its divisors is an integer number (15055964).

Almost surely, 2^51620444 is an apocalyptic number.

It is an amenable number.

51620444 is a deficient number, since it is larger than the sum of its proper divisors (38715340).

51620444 is a wasteful number, since it uses less digits than its factorization.

51620444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12905115 (or 12905113 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 51620444 is about 7184.7368775760. The cubic root of 51620444 is about 372.3407580234.

The spelling of 51620444 in words is "fifty-one million, six hundred twenty thousand, four hundred forty-four".