61812072 has 80 divisors (see below), whose sum is σ = 197878560. Its totient is φ = 17659296.

The previous prime is 61812067. The next prime is 61812083. The reversal of 61812072 is 27021816.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2278 + ... + 11349.

It is an arithmetic number, because the mean of its divisors is an integer number (2473482).

Almost surely, 2^61812072 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 61812072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98939280).

61812072 is an abundant number, since it is smaller than the sum of its proper divisors (136066488).

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

61812072 is a wasteful number, since it uses less digits than its factorization.

61812072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13652 (or 13639 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 61812072 is about 7862.0653774946. The cubic root of 61812072 is about 395.3888644997.

Adding to 61812072 its reverse (27021816), we get a palindrome (88833888).

The spelling of 61812072 in words is "sixty-one million, eight hundred twelve thousand, seventy-two".