7478221437 has 12 divisors (see below), whose sum is σ = 10803725244. Its totient is φ = 4984627200.

The previous prime is 7478221433. The next prime is 7478221451. The reversal of 7478221437 is 7341228747.

It can be written as a sum of positive squares in 2 ways, for example, as 2144986596 + 5333234841 = 46314^2 + 73029^2 .

It is not a de Polignac number, because 7478221437 - 2² = 7478221433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7478221392 and 7478221401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7478221433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13188 + ... + 123005.

It is an arithmetic number, because the mean of its divisors is an integer number (900310437).

Almost surely, 2^7478221437 is an apocalyptic number.

It is an amenable number.

7478221437 is a deficient number, since it is larger than the sum of its proper divisors (3325503807).

7478221437 is a wasteful number, since it uses less digits than its factorization.

7478221437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142300 (or 142297 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 7478221437 is about 86476.7103733716. The cubic root of 7478221437 is about 1955.5373127762.

The spelling of 7478221437 in words is "seven billion, four hundred seventy-eight million, two hundred twenty-one thousand, four hundred thirty-seven".