1687072506 has 32 divisors (see below), whose sum is σ = 3989139840. Its totient is φ = 465398976.

The previous prime is 1687072493. The next prime is 1687072511. The reversal of 1687072506 is 6052707861.

It is a super-2 number, since 2×1687072506² = 5692427281002240072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691341 + ... + 693776.

It is an arithmetic number, because the mean of its divisors is an integer number (124660620).

Almost surely, 2^1687072506 is an apocalyptic number.

1687072506 is an abundant number, since it is smaller than the sum of its proper divisors (2302067334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1687072506 is a wasteful number, since it uses less digits than its factorization.

1687072506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385158.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 1687072506 is about 41073.9881920419. The cubic root of 1687072506 is about 1190.4502464966.

The spelling of 1687072506 in words is "one billion, six hundred eighty-seven million, seventy-two thousand, five hundred six".