1687500749 has 16 divisors (see below), whose sum is σ = 1906200000. Its totient is φ = 1479784320.

The previous prime is 1687500743. The next prime is 1687500781. The reversal of 1687500749 is 9470057861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687500749 is a prime.

It is a super-2 number, since 2×1687500749² = 5695317555751122002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687500743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476417 + ... + 479945.

It is an arithmetic number, because the mean of its divisors is an integer number (119137500).

Almost surely, 2^1687500749 is an apocalyptic number.

It is an amenable number.

1687500749 is a deficient number, since it is larger than the sum of its proper divisors (218699251).

1687500749 is a wasteful number, since it uses less digits than its factorization.

1687500749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 1687500749 is about 41079.2009294241. The cubic root of 1687500749 is about 1190.5509651188.

The spelling of 1687500749 in words is "one billion, six hundred eighty-seven million, five hundred thousand, seven hundred forty-nine".