1028420761 has 3 divisors (see below), whose sum is σ = 1028452831. Its totient is φ = 1028388692.

The previous prime is 1028420749. The next prime is 1028420779. The reversal of 1028420761 is 1670248201.

The square root of 1028420761 is 32069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 851530761 + 176890000 = 29181^2 + 13300^2 .

It is not a de Polignac number, because 1028420761 - 2¹⁵ = 1028387993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028420741) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16035 + ... + 48103.

Almost surely, 2^1028420761 is an apocalyptic number.

1028420761 is the 32069-th square number.

1028420761 is the 16035-th centered octagonal number.

It is an amenable number.

1028420761 is a deficient number, since it is larger than the sum of its proper divisors (32070).

1028420761 is an frugal number, since it uses more digits than its factorization.

1028420761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64138 (or 32069 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The cubic root of 1028420761 is about 1009.3852289199.

Adding to 1028420761 its reverse (1670248201), we get a palindrome (2698668962).

The spelling of 1028420761 in words is "one billion, twenty-eight million, four hundred twenty thousand, seven hundred sixty-one".