16687489 has 48 divisors (see below), whose sum is σ = 23442048. Its totient is φ = 11708928.

The previous prime is 16687487. The next prime is 16687493. The reversal of 16687489 is 98478661.

16687489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16687489 - 2¹ = 16687487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (16687487) 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, 249034 + ... + 249100.

It is an arithmetic number, because the mean of its divisors is an integer number (488376).

Almost surely, 2^16687489 is an apocalyptic number.

It is an amenable number.

16687489 is a deficient number, since it is larger than the sum of its proper divisors (6754559).

16687489 is a wasteful number, since it uses less digits than its factorization.

16687489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 127 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 16687489 is about 4085.0323132137. The cubic root of 16687489 is about 255.5428088650.

The spelling of 16687489 in words is "sixteen million, six hundred eighty-seven thousand, four hundred eighty-nine".