610664778 has 64 divisors (see below), whose sum is σ = 1395446400. Its totient is φ = 197873280.

The previous prime is 610664771. The next prime is 610664779. The reversal of 610664778 is 877466016.

It is a super-2 number, since 2×610664778² = 745822942179578568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (610664771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292125 + ... + 294207.

It is an arithmetic number, because the mean of its divisors is an integer number (21803850).

Almost surely, 2^610664778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 610664778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697723200).

610664778 is an abundant number, since it is smaller than the sum of its proper divisors (784781622).

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

610664778 is a wasteful number, since it uses less digits than its factorization.

610664778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 610664778 is about 24711.6324430419. The cubic root of 610664778 is about 848.4005807750.

The spelling of 610664778 in words is "six hundred ten million, six hundred sixty-four thousand, seven hundred seventy-eight".