61505380 has 24 divisors (see below), whose sum is σ = 129500280. Its totient is φ = 24537600.

The previous prime is 61505377. The next prime is 61505393. The reversal of 61505380 is 8350516.

It can be written as a sum of positive squares in 4 ways, for example, as 40271716 + 21233664 = 6346^2 + 4608^2 .

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4186 + ... + 11854.

It is an arithmetic number, because the mean of its divisors is an integer number (5395845).

Almost surely, 2^61505380 is an apocalyptic number.

It is an amenable number.

61505380 is an abundant number, since it is smaller than the sum of its proper divisors (67994900).

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

61505380 is a wasteful number, since it uses less digits than its factorization.

61505380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079 (or 8077 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 61505380 is about 7842.5365794493. The cubic root of 61505380 is about 394.7338483734.

Adding to 61505380 its reverse (8350516), we get a palindrome (69855896).

The spelling of 61505380 in words is "sixty-one million, five hundred five thousand, three hundred eighty".