61532975790 has 144 divisors (see below), whose sum is σ = 189379610784. Its totient is φ = 13769585280.

The previous prime is 61532975789. The next prime is 61532975809. The reversal of 61532975790 is 9757923516.

61532975790 is a `hidden beast` number, since 61 + 5 + 3 + 2 + 9 + 7 + 579 + 0 = 666.

It is a super-2 number, since 2×61532975790² (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 71 ways as a sum of consecutive naturals, for example, 75754 + ... + 358893.

It is an arithmetic number, because the mean of its divisors is an integer number (1315136186).

Almost surely, 2^61532975790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61532975790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94689805392).

61532975790 is an abundant number, since it is smaller than the sum of its proper divisors (127846634994).

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

61532975790 is a wasteful number, since it uses less digits than its factorization.

61532975790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434695 (or 434681 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 54.

The spelling of 61532975790 in words is "sixty-one billion, five hundred thirty-two million, nine hundred seventy-five thousand, seven hundred ninety".