661084280 has 32 divisors (see below), whose sum is σ = 1491685200. Its totient is φ = 263678976.

The previous prime is 661084273. The next prime is 661084297. The reversal of 661084280 is 82480166.

It is a self number, because there is not a number n which added to its sum of digits gives 661084280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9290 + ... + 37529.

Almost surely, 2^661084280 is an apocalyptic number.

It is an amenable number.

661084280 is an abundant number, since it is smaller than the sum of its proper divisors (830600920).

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

661084280 is a wasteful number, since it uses less digits than its factorization.

661084280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47183 (or 47179 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 661084280 is about 25711.5592681580. The cubic root of 661084280 is about 871.1352950725.

The spelling of 661084280 in words is "six hundred sixty-one million, eighty-four thousand, two hundred eighty".