428879987 has 4 divisors (see below), whose sum is σ = 440471376. Its totient is φ = 417288600.

The previous prime is 428879977. The next prime is 428880031. The reversal of 428879987 is 789978824.

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

It is a cyclic number.

It is not a de Polignac number, because 428879987 - 2⁶ = 428879923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428879977) 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, 5795639 + ... + 5795712.

It is an arithmetic number, because the mean of its divisors is an integer number (110117844).

Almost surely, 2^428879987 is an apocalyptic number.

428879987 is a deficient number, since it is larger than the sum of its proper divisors (11591389).

428879987 is a wasteful number, since it uses less digits than its factorization.

428879987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591388.

The product of its digits is 16257024, while the sum is 62.

The square root of 428879987 is about 20709.4178334399. The cubic root of 428879987 is about 754.1283374854.

The spelling of 428879987 in words is "four hundred twenty-eight million, eight hundred seventy-nine thousand, nine hundred eighty-seven".