428390026 has 8 divisors (see below), whose sum is σ = 644779044. Its totient is φ = 213463680.

The previous prime is 428390009. The next prime is 428390041. The reversal of 428390026 is 620093824.

It can be written as a sum of positive squares in 2 ways, for example, as 265853025 + 162537001 = 16305^2 + 12749^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 428389973 and 428390000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364935 + ... + 366106.

Almost surely, 2^428390026 is an apocalyptic number.

428390026 is a deficient number, since it is larger than the sum of its proper divisors (216389018).

428390026 is a wasteful number, since it uses less digits than its factorization.

428390026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731336.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 428390026 is about 20697.5850282104. The cubic root of 428390026 is about 753.8410510024.

The spelling of 428390026 in words is "four hundred twenty-eight million, three hundred ninety thousand, twenty-six".