687058638 has 32 divisors (see below), whose sum is σ = 1662799104. Its totient is φ = 184755072.

The previous prime is 687058637. The next prime is 687058651. The reversal of 687058638 is 836850786.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687058637) 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, 480420 + ... + 481847.

It is an arithmetic number, because the mean of its divisors is an integer number (51962472).

Almost surely, 2^687058638 is an apocalyptic number.

687058638 is an abundant number, since it is smaller than the sum of its proper divisors (975740466).

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

687058638 is a wasteful number, since it uses less digits than its factorization.

687058638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962296.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 687058638 is about 26211.8034099144. The cubic root of 687058638 is about 882.3981753276.

The spelling of 687058638 in words is "six hundred eighty-seven million, fifty-eight thousand, six hundred thirty-eight".