634881 has 16 divisors (see below), whose sum is σ = 928256. Its totient is φ = 383616.

The previous prime is 634871. The next prime is 634891. The reversal of 634881 is 188436.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (634871) and next prime (634891).

It is not a de Polignac number, because 634881 - 2⁶ = 634817 is a prime.

It is a super-2 number, since 2×634881² = 806147768322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2736 + ... + 2958.

It is an arithmetic number, because the mean of its divisors is an integer number (58016).

It is a Proth number, since it is equal to 155 ⋅ 2¹² + 1 and 155 < 2¹².

2⁶³⁴⁸⁸¹ is an apocalyptic number.

It is an amenable number.

634881 is a deficient number, since it is larger than the sum of its proper divisors (293375).

634881 is a wasteful number, since it uses less digits than its factorization.

634881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 4608, while the sum is 30.

The square root of 634881 is about 796.7942017861. The cubic root of 634881 is about 85.9470108041.

The spelling of 634881 in words is "six hundred thirty-four thousand, eight hundred eighty-one".