51405664 has 12 divisors (see below), whose sum is σ = 101204964. Its totient is φ = 25702816.

The previous prime is 51405647. The next prime is 51405701. The reversal of 51405664 is 46650415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803182 + ... + 803245.

It is an arithmetic number, because the mean of its divisors is an integer number (8433747).

Almost surely, 2^51405664 is an apocalyptic number.

It is an amenable number.

51405664 is a deficient number, since it is larger than the sum of its proper divisors (49799300).

51405664 is a wasteful number, since it uses less digits than its factorization.

51405664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606437 (or 1606429 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 51405664 is about 7169.7743339662. The cubic root of 51405664 is about 371.8236339758.

The spelling of 51405664 in words is "fifty-one million, four hundred five thousand, six hundred sixty-four".