7661262640 has 40 divisors (see below), whose sum is σ = 17841893760. Its totient is φ = 3059437056.

The previous prime is 7661262611. The next prime is 7661262643. The reversal of 7661262640 is 462621667.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 7661262593 and 7661262602.

It is not an unprimeable number, because it can be changed into a prime (7661262643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30325 + ... + 127444.

It is an arithmetic number, because the mean of its divisors is an integer number (446047344).

Almost surely, 2^7661262640 is an apocalyptic number.

It is an amenable number.

7661262640 is an abundant number, since it is smaller than the sum of its proper divisors (10180631120).

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

7661262640 is a wasteful number, since it uses less digits than its factorization.

7661262640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158389 (or 158383 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 7661262640 is about 87528.6389703393. The cubic root of 7661262640 is about 1971.3638283816.

The spelling of 7661262640 in words is "seven billion, six hundred sixty-one million, two hundred sixty-two thousand, six hundred forty".