441664425 has 18 divisors (see below), whose sum is σ = 791070462. Its totient is φ = 235554240.

The previous prime is 441664387. The next prime is 441664427. The reversal of 441664425 is 524466144.

441664425 is a `hidden beast` number, since 4 + 4 + 1 + 6 + 644 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1671849 + 439992576 = 1293^2 + 20976^2 .

It is not a de Polignac number, because 441664425 - 2¹³ = 441656233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 441664425.

It is not an unprimeable number, because it can be changed into a prime (441664427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 981252 + ... + 981701.

It is an arithmetic number, because the mean of its divisors is an integer number (43948359).

Almost surely, 2^441664425 is an apocalyptic number.

441664425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

441664425 is a deficient number, since it is larger than the sum of its proper divisors (349406037).

441664425 is a wasteful number, since it uses less digits than its factorization.

441664425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962969 (or 1962961 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 441664425 is about 21015.8136887440. The cubic root of 441664425 is about 761.5483352655.

The spelling of 441664425 in words is "four hundred forty-one million, six hundred sixty-four thousand, four hundred twenty-five".