7661005770 has 128 divisors (see below), whose sum is σ = 21684879360. Its totient is φ = 1711860480.

The previous prime is 7661005753. The next prime is 7661005811. The reversal of 7661005770 is 775001667.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 215479 + ... + 248501.

It is an arithmetic number, because the mean of its divisors is an integer number (169413120).

Almost surely, 2^7661005770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7661005770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10842439680).

7661005770 is an abundant number, since it is smaller than the sum of its proper divisors (14023873590).

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

7661005770 is a wasteful number, since it uses less digits than its factorization.

7661005770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33100.

The product of its (nonzero) digits is 61740, while the sum is 39.

The square root of 7661005770 is about 87527.1716097350. The cubic root of 7661005770 is about 1971.3417958999.

The spelling of 7661005770 in words is "seven billion, six hundred sixty-one million, five thousand, seven hundred seventy".