61520784 has 80 divisors (see below), whose sum is σ = 180196800. Its totient is φ = 17929728.

The previous prime is 61520783. The next prime is 61520813. The reversal of 61520784 is 48702516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520783) 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, 9262 + ... + 14450.

It is an arithmetic number, because the mean of its divisors is an integer number (2252460).

Almost surely, 2^61520784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61520784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90098400).

61520784 is an abundant number, since it is smaller than the sum of its proper divisors (118676016).

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

61520784 is a wasteful number, since it uses less digits than its factorization.

61520784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232 (or 5226 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 61520784 is about 7843.5185981803. The cubic root of 61520784 is about 394.7667992722.

The spelling of 61520784 in words is "sixty-one million, five hundred twenty thousand, seven hundred eighty-four".