1687278401 has 4 divisors (see below), whose sum is σ = 1715876400. Its totient is φ = 1658680404.

The previous prime is 1687278389. The next prime is 1687278421. The reversal of 1687278401 is 1048727861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1687278401 - 2¹⁰ = 1687277377 is a prime.

It is a super-2 number, since 2×1687278401² = 5693816804962233602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687278421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14298911 + ... + 14299028.

It is an arithmetic number, because the mean of its divisors is an integer number (428969100).

Almost surely, 2^1687278401 is an apocalyptic number.

It is an amenable number.

1687278401 is a deficient number, since it is larger than the sum of its proper divisors (28597999).

1687278401 is an equidigital number, since it uses as much as digits as its factorization.

1687278401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28597998.

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 1687278401 is about 41076.4945071996. The cubic root of 1687278401 is about 1190.4986731414.

The spelling of 1687278401 in words is "one billion, six hundred eighty-seven million, two hundred seventy-eight thousand, four hundred one".