7256621 has 8 divisors (see below), whose sum is σ = 7418424. Its totient is φ = 7096320.

The previous prime is 7256617. The next prime is 7256629. The reversal of 7256621 is 1266527.

It can be written as a sum of positive squares in 4 ways, for example, as 42025 + 7214596 = 205^2 + 2686^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7256621 - 2² = 7256617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7256629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20381 + ... + 20733.

It is an arithmetic number, because the mean of its divisors is an integer number (927303).

Almost surely, 2^7256621 is an apocalyptic number.

It is an amenable number.

7256621 is a deficient number, since it is larger than the sum of its proper divisors (161803).

7256621 is a wasteful number, since it uses less digits than its factorization.

7256621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

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

The square root of 7256621 is about 2693.8116118244. The cubic root of 7256621 is about 193.6027315173.

The spelling of 7256621 in words is "seven million, two hundred fifty-six thousand, six hundred twenty-one".