61387812 has 72 divisors (see below), whose sum is σ = 162769152. Its totient is φ = 19483200.

The previous prime is 61387793. The next prime is 61387813. The reversal of 61387812 is 21878316.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61387813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74362 + ... + 75182.

Almost surely, 2^61387812 is an apocalyptic number.

61387812 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61387812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81384576).

61387812 is an abundant number, since it is smaller than the sum of its proper divisors (101381340).

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

61387812 is a wasteful number, since it uses less digits than its factorization.

61387812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 924 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 61387812 is about 7835.0374600253. The cubic root of 61387812 is about 394.4821756996.

The spelling of 61387812 in words is "sixty-one million, three hundred eighty-seven thousand, eight hundred twelve".