61641536 has 28 divisors (see below), whose sum is σ = 133441440. Its totient is φ = 28018560.

The previous prime is 61641521. The next prime is 61641539. The reversal of 61641536 is 63514616.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641539) 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 3 ways as a sum of consecutive naturals, for example, 43076 + ... + 44483.

Almost surely, 2^61641536 is an apocalyptic number.

It is an amenable number.

61641536 is an abundant number, since it is smaller than the sum of its proper divisors (71799904).

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

61641536 is a wasteful number, since it uses less digits than its factorization.

61641536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87582 (or 87572 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 61641536 is about 7851.2123904528. The cubic root of 61641536 is about 395.0249111032.

Subtracting 61641536 from its reverse (63514616), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 61641536 in words is "sixty-one million, six hundred forty-one thousand, five hundred thirty-six".