61521792 has 64 divisors (see below), whose sum is σ = 164799360. Its totient is φ = 20334080.

The previous prime is 61521781. The next prime is 61521799. The reversal of 61521792 is 29712516.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61521799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49693 + ... + 50915.

It is an arithmetic number, because the mean of its divisors is an integer number (2574990).

Almost surely, 2^61521792 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 61521792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82399680).

61521792 is an abundant number, since it is smaller than the sum of its proper divisors (103277568).

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

61521792 is a wasteful number, since it uses less digits than its factorization.

61521792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371 (or 1359 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 61521792 is about 7843.5828547928. The cubic root of 61521792 is about 394.7689553065.

The spelling of 61521792 in words is "sixty-one million, five hundred twenty-one thousand, seven hundred ninety-two".