16428987 has 48 divisors (see below), whose sum is σ = 26968032. Its totient is φ = 9953280.

The previous prime is 16428983. The next prime is 16428989. The reversal of 16428987 is 78982461.

It is not a de Polignac number, because 16428987 - 2² = 16428983 is a prime.

It is a super-2 number, since 2×16428987² = 539823227692338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16428983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 169323 + ... + 169419.

It is an arithmetic number, because the mean of its divisors is an integer number (561834).

Almost surely, 2^16428987 is an apocalyptic number.

16428987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16428987 is a deficient number, since it is larger than the sum of its proper divisors (10539045).

16428987 is an equidigital number, since it uses as much as digits as its factorization.

16428987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 158 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 16428987 is about 4053.2686809537. The cubic root of 16428987 is about 254.2164181506.

The spelling of 16428987 in words is "sixteen million, four hundred twenty-eight thousand, nine hundred eighty-seven".