7656401 has 4 divisors (see below), whose sum is σ = 7989312. Its totient is φ = 7323492.

The previous prime is 7656379. The next prime is 7656413. The reversal of 7656401 is 1046567.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1046567 = 107 ⋅9781.

It is a cyclic number.

It is not a de Polignac number, because 7656401 - 2¹⁰ = 7655377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7656431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166421 + ... + 166466.

It is an arithmetic number, because the mean of its divisors is an integer number (1997328).

Almost surely, 2^7656401 is an apocalyptic number.

It is an amenable number.

7656401 is a deficient number, since it is larger than the sum of its proper divisors (332911).

7656401 is a wasteful number, since it uses less digits than its factorization.

7656401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332910.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 7656401 is about 2767.0202384515. The cubic root of 7656401 is about 197.0946747905.

The spelling of 7656401 in words is "seven million, six hundred fifty-six thousand, four hundred one".