669286540 has 24 divisors (see below), whose sum is σ = 1513617840. Its totient is φ = 247121088.

The previous prime is 669286537. The next prime is 669286543. The reversal of 669286540 is 45682966.

It is an interprime number because it is at equal distance from previous prime (669286537) and next prime (669286543).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (669286543) 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, 1286830 + ... + 1287349.

It is an arithmetic number, because the mean of its divisors is an integer number (63067410).

Almost surely, 2^669286540 is an apocalyptic number.

It is an amenable number.

669286540 is an abundant number, since it is smaller than the sum of its proper divisors (844331300).

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

669286540 is a wasteful number, since it uses less digits than its factorization.

669286540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574201 (or 2574199 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 669286540 is about 25870.5728579790. The cubic root of 669286540 is about 874.7233040760.

The spelling of 669286540 in words is "six hundred sixty-nine million, two hundred eighty-six thousand, five hundred forty".