505651644 has 18 divisors (see below), whose sum is σ = 1278175080. Its totient is φ = 168550536.

The previous prime is 505651639. The next prime is 505651651. The reversal of 505651644 is 446156505.

505651644 is a `hidden beast` number, since 5 + 0 + 5 + 6 + 5 + 1 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 14045879 = 505651644 / (5 + 0 + 5 + 6 + 5 + 1 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 505651599 and 505651608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7022904 + ... + 7022975.

Almost surely, 2^505651644 is an apocalyptic number.

It is an amenable number.

505651644 is an abundant number, since it is smaller than the sum of its proper divisors (772523436).

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

505651644 is a wasteful number, since it uses less digits than its factorization.

505651644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14045889 (or 14045884 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 505651644 is about 22486.6992686788. The cubic root of 505651644 is about 796.6798040196.

The spelling of 505651644 in words is "five hundred five million, six hundred fifty-one thousand, six hundred forty-four".