7220257 has 8 divisors (see below), whose sum is σ = 8340192. Its totient is φ = 6177600.

The previous prime is 7220249. The next prime is 7220261. The reversal of 7220257 is 7520227.

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

It is not a de Polignac number, because 7220257 - 2³ = 7220249 is a prime.

It is a super-2 number, since 2×7220257² = 104264222292098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7220237) 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, 19119 + ... + 19492.

It is an arithmetic number, because the mean of its divisors is an integer number (1042524).

Almost surely, 2^7220257 is an apocalyptic number.

It is an amenable number.

7220257 is a deficient number, since it is larger than the sum of its proper divisors (1119935).

7220257 is a wasteful number, since it uses less digits than its factorization.

7220257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38639.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 7220257 is about 2687.0535908314. The cubic root of 7220257 is about 193.2787991914.

The spelling of 7220257 in words is "seven million, two hundred twenty thousand, two hundred fifty-seven".