61229690478 has 64 divisors (see below), whose sum is σ = 148971882240. Its totient is φ = 18487418400.

The previous prime is 61229690461. The next prime is 61229690507. The reversal of 61229690478 is 87409692216.

61229690478 is a `hidden beast` number, since 61 + 2 + 29 + 6 + 90 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 21528 + ... + 350603.

It is an arithmetic number, because the mean of its divisors is an integer number (2327685660).

Almost surely, 2^61229690478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61229690478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74485941120).

61229690478 is an abundant number, since it is smaller than the sum of its proper divisors (87742191762).

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

61229690478 is a wasteful number, since it uses less digits than its factorization.

61229690478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372430 (or 372424 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 61229690478 in words is "sixty-one billion, two hundred twenty-nine million, six hundred ninety thousand, four hundred seventy-eight".