7809642945 has 160 divisors (see below), whose sum is σ = 15509450880. Its totient is φ = 3758451840.

The previous prime is 7809642931. The next prime is 7809642949. The reversal of 7809642945 is 5492469087.

It is not a de Polignac number, because 7809642945 - 2⁸ = 7809642689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7809642891 and 7809642900.

It is not an unprimeable number, because it can be changed into a prime (7809642949) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 59615530 + ... + 59615660.

It is an arithmetic number, because the mean of its divisors is an integer number (96934068).

Almost surely, 2^7809642945 is an apocalyptic number.

It is an amenable number.

7809642945 is a deficient number, since it is larger than the sum of its proper divisors (7699807935).

7809642945 is a wasteful number, since it uses less digits than its factorization.

7809642945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The square root of 7809642945 is about 88372.1842267124. The cubic root of 7809642945 is about 1984.0094032226.

The spelling of 7809642945 in words is "seven billion, eight hundred nine million, six hundred forty-two thousand, nine hundred forty-five".