61894026720 has 192 divisors, whose sum is σ = 226048112640. Its totient is φ = 15787436544.

The previous prime is 61894026709. The next prime is 61894026739. The reversal of 61894026720 is 2762049816.

It is a happy number.

61894026720 is a `hidden beast` number, since 6 + 189 + 402 + 67 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212104 + ... + 410823.

It is an arithmetic number, because the mean of its divisors is an integer number (1177333920).

Almost surely, 2^61894026720 is an apocalyptic number.

61894026720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61894026720 is an abundant number, since it is smaller than the sum of its proper divisors (164154085920).

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

61894026720 is a wasteful number, since it uses less digits than its factorization.

61894026720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622974 (or 622960 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 61894026720 in words is "sixty-one billion, eight hundred ninety-four million, twenty-six thousand, seven hundred twenty".