687187401 has 8 divisors (see below), whose sum is σ = 916910400. Its totient is φ = 457794672.

The previous prime is 687187373. The next prime is 687187427. The reversal of 687187401 is 104781786.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687187401 - 2¹¹ = 687185353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687187001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77670 + ... + 86063.

It is an arithmetic number, because the mean of its divisors is an integer number (114613800).

Almost surely, 2^687187401 is an apocalyptic number.

It is an amenable number.

687187401 is a deficient number, since it is larger than the sum of its proper divisors (229722999).

687187401 is a wasteful number, since it uses less digits than its factorization.

687187401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165135.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 687187401 is about 26214.2594974567. The cubic root of 687187401 is about 882.4532958722.

The spelling of 687187401 in words is "six hundred eighty-seven million, one hundred eighty-seven thousand, four hundred one".