61904520 has 192 divisors, whose sum is σ = 218073600. Its totient is φ = 15603840.

The previous prime is 61904519. The next prime is 61904533. The reversal of 61904520 is 2540916.

61904520 is a `hidden beast` number, since 619 + 0 + 45 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1439619 + ... + 1439661.

It is an arithmetic number, because the mean of its divisors is an integer number (1135800).

Almost surely, 2^61904520 is an apocalyptic number.

61904520 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 61904520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109036800).

61904520 is an abundant number, since it is smaller than the sum of its proper divisors (156169080).

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

61904520 is a wasteful number, since it uses less digits than its factorization.

61904520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61904520 is about 7867.9425519001. The cubic root of 61904520 is about 395.5858848146.

The spelling of 61904520 in words is "sixty-one million, nine hundred four thousand, five hundred twenty".