7620813 has 6 divisors (see below), whose sum is σ = 11007854. Its totient is φ = 5080536.

The previous prime is 7620787. The next prime is 7620839. The reversal of 7620813 is 3180267.

It is an interprime number because it is at equal distance from previous prime (7620787) and next prime (7620839).

It can be written as a sum of positive squares in only one way, i.e., 7387524 + 233289 = 2718^2 + 483^2 .

It is not a de Polignac number, because 7620813 - 2⁶ = 7620749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7620863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423370 + ... + 423387.

Almost surely, 2^7620813 is an apocalyptic number.

It is an amenable number.

7620813 is a deficient number, since it is larger than the sum of its proper divisors (3387041).

7620813 is a wasteful number, since it uses less digits than its factorization.

7620813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846763 (or 846760 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 7620813 is about 2760.5820038535. The cubic root of 7620813 is about 196.7888260808.

The spelling of 7620813 in words is "seven million, six hundred twenty thousand, eight hundred thirteen".