61504380 has 192 divisors, whose sum is σ = 223534080. Its totient is φ = 13747968.

The previous prime is 61504379. The next prime is 61504393. The reversal of 61504380 is 8340516.

61504380 is a `hidden beast` number, since 615 + 0 + 43 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 200187 + ... + 200493.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^61504380 is an apocalyptic number.

61504380 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 61504380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111767040).

61504380 is an abundant number, since it is smaller than the sum of its proper divisors (162029700).

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

61504380 is a wasteful number, since it uses less digits than its factorization.

61504380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 61504380 is about 7842.4728243074. The cubic root of 61504380 is about 394.7317090701.

Adding to 61504380 its reverse (8340516), we get a palindrome (69844896).

The spelling of 61504380 in words is "sixty-one million, five hundred four thousand, three hundred eighty".