428961666 has 32 divisors (see below), whose sum is σ = 991509120. Its totient is φ = 121182336.

The previous prime is 428961641. The next prime is 428961667. The reversal of 428961666 is 666169824.

It is a happy number.

It is a super-2 number, since 2×428961666² = 368016221794991112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428961667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53641 + ... + 61116.

It is an arithmetic number, because the mean of its divisors is an integer number (30984660).

Almost surely, 2^428961666 is an apocalyptic number.

428961666 is an abundant number, since it is smaller than the sum of its proper divisors (562547454).

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

428961666 is a wasteful number, since it uses less digits than its factorization.

428961666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114858.

The product of its digits is 746496, while the sum is 48.

The square root of 428961666 is about 20711.3897650544. The cubic root of 428961666 is about 754.1762083277.

The spelling of 428961666 in words is "four hundred twenty-eight million, nine hundred sixty-one thousand, six hundred sixty-six".