782061421 has 8 divisors (see below), whose sum is σ = 828309240. Its totient is φ = 735840768.

The previous prime is 782061407. The next prime is 782061463. The reversal of 782061421 is 124160287.

It can be written as a sum of positive squares in 4 ways, for example, as 56836521 + 725224900 = 7539^2 + 26930^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 782061421 - 2¹¹ = 782059373 is a prime.

It is a super-2 number, since 2×782061421² = 1223240132433078482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (782061491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110625 + ... + 117481.

It is an arithmetic number, because the mean of its divisors is an integer number (103538655).

Almost surely, 2^782061421 is an apocalyptic number.

It is an amenable number.

782061421 is a deficient number, since it is larger than the sum of its proper divisors (46247819).

782061421 is a wasteful number, since it uses less digits than its factorization.

782061421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13583.

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

The square root of 782061421 is about 27965.3610918937. The cubic root of 782061421 is about 921.3266230553.

The spelling of 782061421 in words is "seven hundred eighty-two million, sixty-one thousand, four hundred twenty-one".