663894072 has 24 divisors (see below), whose sum is σ = 1798046640. Its totient is φ = 221298000.

The previous prime is 663894061. The next prime is 663894073. The reversal of 663894072 is 270498366.

663894072 is a `hidden beast` number, since 6 + 638 + 9 + 4 + 0 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663894073) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 4610304 + ... + 4610447.

It is an arithmetic number, because the mean of its divisors is an integer number (74918610).

Almost surely, 2^663894072 is an apocalyptic number.

It is an amenable number.

663894072 is an abundant number, since it is smaller than the sum of its proper divisors (1134152568).

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

663894072 is a wasteful number, since it uses less digits than its factorization.

663894072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220763 (or 9220756 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 663894072 is about 25766.1419696469. The cubic root of 663894072 is about 872.3677397131.

The spelling of 663894072 in words is "six hundred sixty-three million, eight hundred ninety-four thousand, seventy-two".