61528731100 has 18 divisors (see below), whose sum is σ = 133517346704. Its totient is φ = 24611492400.

The previous prime is 61528731071. The next prime is 61528731101. The reversal of 61528731100 is 113782516.

It is a happy number.

It is a super-2 number, since 2×61528731100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61528731101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307643556 + ... + 307643755.

Almost surely, 2^61528731100 is an apocalyptic number.

It is an amenable number.

61528731100 is an abundant number, since it is smaller than the sum of its proper divisors (71988615604).

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

61528731100 is a wasteful number, since it uses less digits than its factorization.

61528731100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615287325 (or 615287318 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 61528731100 in words is "sixty-one billion, five hundred twenty-eight million, seven hundred thirty-one thousand, one hundred".