61115380 has 48 divisors (see below), whose sum is σ = 131410944. Its totient is φ = 23869440.

The previous prime is 61115377. The next prime is 61115389. The reversal of 61115380 is 8351116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61115389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273949 + ... + 274171.

It is an arithmetic number, because the mean of its divisors is an integer number (2737728).

Almost surely, 2^61115380 is an apocalyptic number.

It is an amenable number.

61115380 is an abundant number, since it is smaller than the sum of its proper divisors (70295564).

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

61115380 is a wasteful number, since it uses less digits than its factorization.

61115380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 61115380 is about 7817.6326339884. The cubic root of 61115380 is about 393.8977549116.

Adding to 61115380 its reverse (8351116), we get a palindrome (69466496).

The spelling of 61115380 in words is "sixty-one million, one hundred fifteen thousand, three hundred eighty".