61573820 has 48 divisors (see below), whose sum is σ = 161215488. Its totient is φ = 19191360.

The previous prime is 61573817. The next prime is 61573867. The reversal of 61573820 is 2837516.

It is a happy number.

61573820 is nontrivially palindromic in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18452 + ... + 21531.

It is an arithmetic number, because the mean of its divisors is an integer number (3358656).

Almost surely, 2^61573820 is an apocalyptic number.

It is an amenable number.

61573820 is an abundant number, since it is smaller than the sum of its proper divisors (99641668).

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

61573820 is a wasteful number, since it uses less digits than its factorization.

61573820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40010 (or 40008 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 61573820 is about 7846.8987504619. The cubic root of 61573820 is about 394.8802072245.

The spelling of 61573820 in words is "sixty-one million, five hundred seventy-three thousand, eight hundred twenty".