61528495644 has 288 divisors, whose sum is σ = 210939276800. Its totient is φ = 15139872000.

The previous prime is 61528495603. The next prime is 61528495649. The reversal of 61528495644 is 44659482516.

It is a happy number.

61528495644 is a `hidden beast` number, since 6 + 15 + 28 + 49 + 564 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61528495649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1720344 + ... + 1755744.

Almost surely, 2^61528495644 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 61528495644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105469638400).

61528495644 is an abundant number, since it is smaller than the sum of its proper divisors (149410781156).

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

61528495644 is a wasteful number, since it uses less digits than its factorization.

61528495644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35462 (or 35443 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 61528495644 in words is "sixty-one billion, five hundred twenty-eight million, four hundred ninety-five thousand, six hundred forty-four".