428291215 has 16 divisors (see below), whose sum is σ = 561075840. Its totient is φ = 311260320.

The previous prime is 428291189. The next prime is 428291221. The reversal of 428291215 is 512192824.

It is not a de Polignac number, because 428291215 - 2⁹ = 428290703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138112 + ... + 141178.

It is an arithmetic number, because the mean of its divisors is an integer number (35067240).

Almost surely, 2^428291215 is an apocalyptic number.

428291215 is a deficient number, since it is larger than the sum of its proper divisors (132784625).

428291215 is a wasteful number, since it uses less digits than its factorization.

428291215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5622.

The product of its digits is 11520, while the sum is 34.

The square root of 428291215 is about 20695.1978729366. The cubic root of 428291215 is about 753.7830870666.

It can be divided in two parts, 42829 and 1215, that added together give a palindrome (44044).

The spelling of 428291215 in words is "four hundred twenty-eight million, two hundred ninety-one thousand, two hundred fifteen".