782221530 has 16 divisors (see below), whose sum is σ = 1877331744. Its totient is φ = 208592400.

The previous prime is 782221523. The next prime is 782221537. The reversal of 782221530 is 35122287.

It is an interprime number because it is at equal distance from previous prime (782221523) and next prime (782221537).

It is a super-2 number, since 2×782221530² = 1223741043991081800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 26074051 = 782221530 / (7 + 8 + 2 + 2 + 2 + 1 + 5 + 3 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (782221537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13036996 + ... + 13037055.

It is an arithmetic number, because the mean of its divisors is an integer number (117333234).

Almost surely, 2^782221530 is an apocalyptic number.

782221530 is an abundant number, since it is smaller than the sum of its proper divisors (1095110214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

782221530 is a wasteful number, since it uses less digits than its factorization.

782221530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26074061.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 782221530 is about 27968.2235760514. The cubic root of 782221530 is about 921.3894922089.

The spelling of 782221530 in words is "seven hundred eighty-two million, two hundred twenty-one thousand, five hundred thirty".