61491000288 has 48 divisors (see below), whose sum is σ = 170908814160. Its totient is φ = 19291293696.

The previous prime is 61491000287. The next prime is 61491000343. The reversal of 61491000288 is 88200019416.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×61491000288² (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 (61491000287) 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, 18837523 + ... + 18840786.

It is an arithmetic number, because the mean of its divisors is an integer number (3560600295).

Almost surely, 2^61491000288 is an apocalyptic number.

61491000288 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

61491000288 is an abundant number, since it is smaller than the sum of its proper divisors (109417813872).

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

61491000288 is a wasteful number, since it uses less digits than its factorization.

61491000288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37678339 (or 37678331 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 61491000288 in words is "sixty-one billion, four hundred ninety-one million, two hundred eighty-eight", and thus it is an aban number.