428656019 has 16 divisors (see below), whose sum is σ = 474025824. Its totient is φ = 384384000.

The previous prime is 428656013. The next prime is 428656051. The reversal of 428656019 is 910656824.

It is a happy number.

It is not a de Polignac number, because 428656019 - 2⁸ = 428655763 is a prime.

It is a super-2 number, since 2×428656019² = 367491965249856722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428656013) 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, 391637 + ... + 392729.

It is an arithmetic number, because the mean of its divisors is an integer number (29626614).

Almost surely, 2^428656019 is an apocalyptic number.

428656019 is a deficient number, since it is larger than the sum of its proper divisors (45369805).

428656019 is a wasteful number, since it uses less digits than its factorization.

428656019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 428656019 is about 20704.0097324166. The cubic root of 428656019 is about 753.9970419948.

It can be divided in two parts, 42865 and 6019, that added together give a palindrome (48884).

The spelling of 428656019 in words is "four hundred twenty-eight million, six hundred fifty-six thousand, nineteen".