428908747 has 4 divisors (see below), whose sum is σ = 429334840. Its totient is φ = 428482656.

The previous prime is 428908729. The next prime is 428908757. The reversal of 428908747 is 747809824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428908747 is a prime.

It is a super-2 number, since 2×428908747² = 367925426506220018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428908747.

It is not an unprimeable number, because it can be changed into a prime (428908757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211533 + ... + 213550.

It is an arithmetic number, because the mean of its divisors is an integer number (107333710).

Almost surely, 2^428908747 is an apocalyptic number.

428908747 is a deficient number, since it is larger than the sum of its proper divisors (426093).

428908747 is a wasteful number, since it uses less digits than its factorization.

428908747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426092.

The product of its (nonzero) digits is 903168, while the sum is 49.

The square root of 428908747 is about 20710.1121918738. The cubic root of 428908747 is about 754.1451939852.

The spelling of 428908747 in words is "four hundred twenty-eight million, nine hundred eight thousand, seven hundred forty-seven".