428648026 has 4 divisors (see below), whose sum is σ = 642972042. Its totient is φ = 214324012.

The previous prime is 428648023. The next prime is 428648027. The reversal of 428648026 is 620846824.

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., 420209001 + 8439025 = 20499^2 + 2905^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 428648026.

It is not an unprimeable number, because it can be changed into a prime (428648021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107162005 + ... + 107162008.

Almost surely, 2^428648026 is an apocalyptic number.

428648026 is a deficient number, since it is larger than the sum of its proper divisors (214324016).

428648026 is a wasteful number, since it uses less digits than its factorization.

428648026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214324015.

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 428648026 is about 20703.8167012752. The cubic root of 428648026 is about 753.9923554587.

The spelling of 428648026 in words is "four hundred twenty-eight million, six hundred forty-eight thousand, twenty-six".