7620745409 has 4 divisors (see below), whose sum is σ = 7623900804. Its totient is φ = 7617590016.

The previous prime is 7620745403. The next prime is 7620745427. The reversal of 7620745409 is 9045470267.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9045470267 = 1103 ⋅8200789.

It can be written as a sum of positive squares in 2 ways, for example, as 6064048384 + 1556697025 = 77872^2 + 39455^2 .

It is a cyclic number.

It is not a de Polignac number, because 7620745409 - 2²⁴ = 7603968193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7620745409.

It is not an unprimeable number, because it can be changed into a prime (7620745403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574072 + ... + 1578905.

It is an arithmetic number, because the mean of its divisors is an integer number (1905975201).

Almost surely, 2^7620745409 is an apocalyptic number.

It is an amenable number.

7620745409 is a deficient number, since it is larger than the sum of its proper divisors (3155395).

7620745409 is a wasteful number, since it uses less digits than its factorization.

7620745409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155394.

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 7620745409 is about 87296.8808663861. The cubic root of 7620745409 is about 1967.8824428844.

The spelling of 7620745409 in words is "seven billion, six hundred twenty million, seven hundred forty-five thousand, four hundred nine".