636477 has 8 divisors (see below), whose sum is σ = 864864. Its totient is φ = 416208.

The previous prime is 636473. The next prime is 636499. The reversal of 636477 is 774636.

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

It is not a de Polignac number, because 636477 - 2² = 636473 is a prime.

636477 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636477.

It is not an unprimeable number, because it can be changed into a prime (636473) 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, 1843 + ... + 2160.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2⁶³⁶⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

636477 is a deficient number, since it is larger than the sum of its proper divisors (228387).

636477 is a wasteful number, since it uses less digits than its factorization.

636477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059.

The product of its digits is 21168, while the sum is 33.

The square root of 636477 is about 797.7950864727. The cubic root of 636477 is about 86.0189700355.

It can be divided in two parts, 6364 and 77, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 636477 in words is "six hundred thirty-six thousand, four hundred seventy-seven".