636421602 has 16 divisors (see below), whose sum is σ = 1277686080. Its totient is φ = 211333392.

The previous prime is 636421589. The next prime is 636421603. The reversal of 636421602 is 206124636.

It is a self number, because there is not a number n which added to its sum of digits gives 636421602.

It is not an unprimeable number, because it can be changed into a prime (636421603) 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, 200077 + ... + 203232.

It is an arithmetic number, because the mean of its divisors is an integer number (79855380).

Almost surely, 2^636421602 is an apocalyptic number.

636421602 is an abundant number, since it is smaller than the sum of its proper divisors (641264478).

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

636421602 is a wasteful number, since it uses less digits than its factorization.

636421602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403577.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 636421602 is about 25227.3978444072. The cubic root of 636421602 is about 860.1647430925.

It can be divided in two parts, 6364 and 21602, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 636421602 in words is "six hundred thirty-six million, four hundred twenty-one thousand, six hundred two".