61389972 has 72 divisors (see below), whose sum is σ = 180398400. Its totient is φ = 17238528.

The previous prime is 61389971. The next prime is 61389989. The reversal of 61389972 is 27998316.

61389972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61389971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12804 + ... + 16932.

Almost surely, 2^61389972 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 61389972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90199200).

61389972 is an abundant number, since it is smaller than the sum of its proper divisors (119008428).

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

61389972 is a wasteful number, since it uses less digits than its factorization.

61389972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205 (or 4200 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 61389972 is about 7835.1753011659. The cubic root of 61389972 is about 394.4868024133.

It can be divided in two parts, 6138 and 9972, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 61389972 in words is "sixty-one million, three hundred eighty-nine thousand, nine hundred seventy-two".