7821428554 has 4 divisors (see below), whose sum is σ = 11732142834. Its totient is φ = 3910714276.

The previous prime is 7821428521. The next prime is 7821428569. The reversal of 7821428554 is 4558241287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6808725225 + 1012703329 = 82515^2 + 31823^2 .

It is a super-2 number, since 2×7821428554² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955357137 + ... + 1955357140.

Almost surely, 2^7821428554 is an apocalyptic number.

7821428554 is a deficient number, since it is larger than the sum of its proper divisors (3910714280).

7821428554 is a wasteful number, since it uses less digits than its factorization.

7821428554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910714279.

The product of its digits is 716800, while the sum is 46.

The square root of 7821428554 is about 88438.8407545011. The cubic root of 7821428554 is about 1985.0069309675.

The spelling of 7821428554 in words is "seven billion, eight hundred twenty-one million, four hundred twenty-eight thousand, five hundred fifty-four".