61668340 has 12 divisors (see below), whose sum is σ = 129503556. Its totient is φ = 24667328.

The previous prime is 61668311. The next prime is 61668349. The reversal of 61668340 is 4386616.

It can be written as a sum of positive squares in 2 ways, for example, as 9511056 + 52157284 = 3084^2 + 7222^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61668296 and 61668305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61668349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541689 + ... + 1541728.

It is an arithmetic number, because the mean of its divisors is an integer number (10791963).

Almost surely, 2^61668340 is an apocalyptic number.

It is an amenable number.

61668340 is an abundant number, since it is smaller than the sum of its proper divisors (67835216).

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

61668340 is a wasteful number, since it uses less digits than its factorization.

61668340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083426 (or 3083424 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 61668340 is about 7852.9192024368. The cubic root of 61668340 is about 395.0821599111.

The spelling of 61668340 in words is "sixty-one million, six hundred sixty-eight thousand, three hundred forty".