428494815 has 96 divisors (see below), whose sum is σ = 875796480. Its totient is φ = 189775872.

The previous prime is 428494811. The next prime is 428494849. The reversal of 428494815 is 518494824.

It is not a de Polignac number, because 428494815 - 2² = 428494811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428494811) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1667167 + ... + 1667423.

It is an arithmetic number, because the mean of its divisors is an integer number (9122880).

Almost surely, 2^428494815 is an apocalyptic number.

428494815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

428494815 is an abundant number, since it is smaller than the sum of its proper divisors (447301665).

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

428494815 is a wasteful number, since it uses less digits than its factorization.

428494815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 418 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 428494815 is about 20700.1163040211. The cubic root of 428494815 is about 753.9025119804.

Subtracting 428494815 from its reverse (518494824), we obtain a palindrome (90000009).

It can be divided in two parts, 4284 and 94815, that added together give a palindrome (99099).

The spelling of 428494815 in words is "four hundred twenty-eight million, four hundred ninety-four thousand, eight hundred fifteen".