661884030 has 24 divisors (see below), whose sum is σ = 1720898712. Its totient is φ = 176502384.

The previous prime is 661883969. The next prime is 661884031. The reversal of 661884030 is 30488166.

It is a happy number.

661884030 is a `hidden beast` number, since 6 + 618 + 8 + 4 + 0 + 30 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661884031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3677044 + ... + 3677223.

It is an arithmetic number, because the mean of its divisors is an integer number (71704113).

Almost surely, 2^661884030 is an apocalyptic number.

661884030 is an abundant number, since it is smaller than the sum of its proper divisors (1059014682).

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

661884030 is a wasteful number, since it uses less digits than its factorization.

661884030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7354280 (or 7354277 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 661884030 is about 25727.1069108052. The cubic root of 661884030 is about 871.4864402645.

The spelling of 661884030 in words is "six hundred sixty-one million, eight hundred eighty-four thousand, thirty".