428188815 has 64 divisors (see below), whose sum is σ = 799027200. Its totient is φ = 217147392.

The previous prime is 428188801. The next prime is 428188837. The reversal of 428188815 is 518881824.

It is not a de Polignac number, because 428188815 - 2⁷ = 428188687 is a prime.

It is a super-2 number, since 2×428188815² = 366691322582208450, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 741807 + ... + 742383.

It is an arithmetic number, because the mean of its divisors is an integer number (12484800).

Almost surely, 2^428188815 is an apocalyptic number.

428188815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

428188815 is a deficient number, since it is larger than the sum of its proper divisors (370838385).

428188815 is a wasteful number, since it uses less digits than its factorization.

428188815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 847 counting only the distinct ones).

The product of its digits is 163840, while the sum is 45.

The square root of 428188815 is about 20692.7237211538. The cubic root of 428188815 is about 753.7230083649.

It can be divided in two parts, 4281 and 88815, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 428188815 in words is "four hundred twenty-eight million, one hundred eighty-eight thousand, eight hundred fifteen".