661227480 has 96 divisors (see below), whose sum is σ = 2162862000. Its totient is φ = 175189248.

The previous prime is 661227467. The next prime is 661227533. The reversal of 661227480 is 84722166.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50671 + ... + 62369.

Almost surely, 2^661227480 is an apocalyptic number.

661227480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661227480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081431000).

661227480 is an abundant number, since it is smaller than the sum of its proper divisors (1501634520).

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

661227480 is a wasteful number, since it uses less digits than its factorization.

661227480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11873 (or 11866 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 661227480 is about 25714.3438570771. The cubic root of 661227480 is about 871.1981905165.

The spelling of 661227480 in words is "six hundred sixty-one million, two hundred twenty-seven thousand, four hundred eighty".