61821592 has 64 divisors (see below), whose sum is σ = 141120000. Its totient is φ = 24800256.

The previous prime is 61821587. The next prime is 61821593. The reversal of 61821592 is 29512816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61821593) 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, 102909 + ... + 103507.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^61821592 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 61821592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560000).

61821592 is an abundant number, since it is smaller than the sum of its proper divisors (79298408).

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

61821592 is a wasteful number, since it uses less digits than its factorization.

61821592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 724 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 61821592 is about 7862.6707930575. The cubic root of 61821592 is about 395.4091620923.

The spelling of 61821592 in words is "sixty-one million, eight hundred twenty-one thousand, five hundred ninety-two".