61668530 has 48 divisors (see below), whose sum is σ = 138884544. Its totient is φ = 19153440.

The previous prime is 61668527. The next prime is 61668539. The reversal of 61668530 is 3586616.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (61668539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217769 + ... + 218051.

It is an arithmetic number, because the mean of its divisors is an integer number (2893428).

Almost surely, 2^61668530 is an apocalyptic number.

61668530 is an abundant number, since it is smaller than the sum of its proper divisors (77216014).

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

61668530 is a wasteful number, since it uses less digits than its factorization.

61668530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 61668530 is about 7852.9312998396. The cubic root of 61668530 is about 395.0825656598.

The spelling of 61668530 in words is "sixty-one million, six hundred sixty-eight thousand, five hundred thirty".