7640245873 has 8 divisors (see below), whose sum is σ = 8236125800. Its totient is φ = 7045532928.

The previous prime is 7640245861. The next prime is 7640245897. The reversal of 7640245873 is 3785420467.

It can be written as a sum of positive squares in 4 ways, for example, as 109998144 + 7530247729 = 10488^2 + 86777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640245873 is a prime.

It is the 87409-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7640245813) by changing a digit.

It is a nontrivial repunit in base 87408.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278118 + ... + 304351.

It is an arithmetic number, because the mean of its divisors is an integer number (1029515725).

Almost surely, 2^7640245873 is an apocalyptic number.

It is an amenable number.

7640245873 is a deficient number, since it is larger than the sum of its proper divisors (595879927).

7640245873 is a wasteful number, since it uses less digits than its factorization.

7640245873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583491.

The product of its (nonzero) digits is 1128960, while the sum is 46.

The square root of 7640245873 is about 87408.5000042902. The cubic root of 7640245873 is about 1969.5595288428.

The spelling of 7640245873 in words is "seven billion, six hundred forty million, two hundred forty-five thousand, eight hundred seventy-three".