1428051987 has 12 divisors (see below), whose sum is σ = 2063091784. Its totient is φ = 951873120.

The previous prime is 1428051979. The next prime is 1428051997. The reversal of 1428051987 is 7891508241.

It is not a de Polignac number, because 1428051987 - 2³ = 1428051979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428051997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69312 + ... + 87522.

Almost surely, 2^1428051987 is an apocalyptic number.

1428051987 is a deficient number, since it is larger than the sum of its proper divisors (635039797).

1428051987 is a wasteful number, since it uses less digits than its factorization.

1428051987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26930 (or 26927 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 1428051987 is about 37789.5751100750. The cubic root of 1428051987 is about 1126.1113592361. Note that the first 3 decimals are identical.

The spelling of 1428051987 in words is "one billion, four hundred twenty-eight million, fifty-one thousand, nine hundred eighty-seven".