61321733428 has 24 divisors (see below), whose sum is σ = 111026853000. Its totient is φ = 29600030208.

The previous prime is 61321733411. The next prime is 61321733437. The reversal of 61321733428 is 82433712316.

61321733428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 50081068944 + 11240664484 = 223788^2 + 106022^2 .

It is a super-2 number, since 2×61321733428² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111848 + ... + 1165696.

It is an arithmetic number, because the mean of its divisors is an integer number (4626118875).

Almost surely, 2^61321733428 is an apocalyptic number.

It is an amenable number.

61321733428 is a deficient number, since it is larger than the sum of its proper divisors (49705119572).

61321733428 is a wasteful number, since it uses less digits than its factorization.

61321733428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63699 (or 63697 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The spelling of 61321733428 in words is "sixty-one billion, three hundred twenty-one million, seven hundred thirty-three thousand, four hundred twenty-eight".