639286546 has 4 divisors (see below), whose sum is σ = 958929822. Its totient is φ = 319643272.

The previous prime is 639286511. The next prime is 639286567. The reversal of 639286546 is 645682936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 511257321 + 128029225 = 22611^2 + 11315^2 .

It is a super-2 number, since 2×639286546² = 817374575793220232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639286546.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159821635 + ... + 159821638.

Almost surely, 2^639286546 is an apocalyptic number.

639286546 is a deficient number, since it is larger than the sum of its proper divisors (319643276).

639286546 is a wasteful number, since it uses less digits than its factorization.

639286546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319643275.

The product of its digits is 1866240, while the sum is 49.

The square root of 639286546 is about 25284.1164765550. The cubic root of 639286546 is about 861.4535298524.

The spelling of 639286546 in words is "six hundred thirty-nine million, two hundred eighty-six thousand, five hundred forty-six".