61218674400 has 288 divisors, whose sum is σ = 219833617248. Its totient is φ = 14701363200.

The previous prime is 61218674399. The next prime is 61218674401. The reversal of 61218674400 is 447681216.

It is an interprime number because it is at equal distance from previous prime (61218674399) and next prime (61218674401).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61218674401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1255272 + ... + 1303128.

It is an arithmetic number, because the mean of its divisors is an integer number (763311171).

Almost surely, 2^61218674400 is an apocalyptic number.

61218674400 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 61218674400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109916808624).

61218674400 is an abundant number, since it is smaller than the sum of its proper divisors (158614942848).

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

61218674400 is a wasteful number, since it uses less digits than its factorization.

61218674400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47934 (or 47921 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 61218674400 in words is "sixty-one billion, two hundred eighteen million, six hundred seventy-four thousand, four hundred".