61867588728 has 32 divisors (see below), whose sum is σ = 168729788160. Its totient is φ = 18747754080.

The previous prime is 61867588681. The next prime is 61867588729. The reversal of 61867588728 is 82788576816.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61867588729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117173200 + ... + 117173727.

It is an arithmetic number, because the mean of its divisors is an integer number (5272805880).

Almost surely, 2^61867588728 is an apocalyptic number.

It is an amenable number.

61867588728 is an abundant number, since it is smaller than the sum of its proper divisors (106862199432).

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

61867588728 is a wasteful number, since it uses less digits than its factorization.

61867588728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234346947 (or 234346943 counting only the distinct ones).

The product of its digits is 72253440, while the sum is 66.

The spelling of 61867588728 in words is "sixty-one billion, eight hundred sixty-seven million, five hundred eighty-eight thousand, seven hundred twenty-eight".