61368402720 has 96 divisors (see below), whose sum is σ = 193518194688. Its totient is φ = 16347322368.

The previous prime is 61368402701. The next prime is 61368402743. The reversal of 61368402720 is 2720486316.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381537 + ... + 517983.

It is an arithmetic number, because the mean of its divisors is an integer number (2015814528).

Almost surely, 2^61368402720 is an apocalyptic number.

61368402720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61368402720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96759097344).

61368402720 is an abundant number, since it is smaller than the sum of its proper divisors (132149791968).

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

61368402720 is a wasteful number, since it uses less digits than its factorization.

61368402720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137402 (or 137394 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 61368402720 in words is "sixty-one billion, three hundred sixty-eight million, four hundred two thousand, seven hundred twenty".