7631420257 has 16 divisors (see below), whose sum is σ = 7949021184. Its totient is φ = 7318530000.

The previous prime is 7631420249. The next prime is 7631420261. The reversal of 7631420257 is 7520241367.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7631420257 - 2³ = 7631420249 is a prime.

It is a super-3 number, since 3×7631420257³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7631420297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2184282 + ... + 2187772.

It is an arithmetic number, because the mean of its divisors is an integer number (496813824).

Almost surely, 2^7631420257 is an apocalyptic number.

It is an amenable number.

7631420257 is a deficient number, since it is larger than the sum of its proper divisors (317600927).

7631420257 is a wasteful number, since it uses less digits than its factorization.

7631420257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 7631420257 is about 87358.0005322924. Note that the first 3 decimals coincide. The cubic root of 7631420257 is about 1968.8008589505.

The spelling of 7631420257 in words is "seven billion, six hundred thirty-one million, four hundred twenty thousand, two hundred fifty-seven".