61216812 has 36 divisors (see below), whose sum is σ = 155742496. Its totient is φ = 20273760.

The previous prime is 61216811. The next prime is 61216861. The reversal of 61216812 is 21861216.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (61216811) 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 11 ways as a sum of consecutive naturals, for example, 237 + ... + 11067.

Almost surely, 2^61216812 is an apocalyptic number.

It is an amenable number.

61216812 is an abundant number, since it is smaller than the sum of its proper divisors (94525684).

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

61216812 is a wasteful number, since it uses less digits than its factorization.

61216812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10998 (or 10993 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 61216812 is about 7824.1173304086. The cubic root of 61216812 is about 394.1155492644.

It can be divided in two parts, 612 and 16812, that added together give a square (17424 = 132²).

The spelling of 61216812 in words is "sixty-one million, two hundred sixteen thousand, eight hundred twelve".