61820836 has 72 divisors (see below), whose sum is σ = 138354048. Its totient is φ = 23654400.

The previous prime is 61820827. The next prime is 61820861. The reversal of 61820836 is 63802816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240420 + ... + 240676.

It is an arithmetic number, because the mean of its divisors is an integer number (1921584).

Almost surely, 2^61820836 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 61820836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69177024).

61820836 is an abundant number, since it is smaller than the sum of its proper divisors (76533212).

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

61820836 is a wasteful number, since it uses less digits than its factorization.

61820836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 61820836 is about 7862.6227176433. The cubic root of 61820836 is about 395.4075503008.

The spelling of 61820836 in words is "sixty-one million, eight hundred twenty thousand, eight hundred thirty-six".