7728701670 has 160 divisors (see below), whose sum is σ = 22203263808. Its totient is φ = 1922199552.

The previous prime is 7728701657. The next prime is 7728701723. The reversal of 7728701670 is 761078277.

It is a happy number.

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 polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1553527 + ... + 1558493.

Almost surely, 2^7728701670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7728701670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11101631904).

7728701670 is an abundant number, since it is smaller than the sum of its proper divisors (14474562138).

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

7728701670 is a wasteful number, since it uses less digits than its factorization.

7728701670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5107 counting only the distinct ones).

The product of its (nonzero) digits is 230496, while the sum is 45.

The square root of 7728701670 is about 87913.0346990706. The cubic root of 7728701670 is about 1977.1313140849.

The spelling of 7728701670 in words is "seven billion, seven hundred twenty-eight million, seven hundred one thousand, six hundred seventy".