1687172428 has 6 divisors (see below), whose sum is σ = 2952551756. Its totient is φ = 843586212.

The previous prime is 1687172407. The next prime is 1687172441. The reversal of 1687172428 is 8242717861.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210896550 + ... + 210896557.

Almost surely, 2^1687172428 is an apocalyptic number.

It is an amenable number.

1687172428 is a deficient number, since it is larger than the sum of its proper divisors (1265379328).

1687172428 is a wasteful number, since it uses less digits than its factorization.

1687172428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421793111 (or 421793109 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The square root of 1687172428 is about 41075.2045399655. The cubic root of 1687172428 is about 1190.4737487114.

The spelling of 1687172428 in words is "one billion, six hundred eighty-seven million, one hundred seventy-two thousand, four hundred twenty-eight".