775421664 has 48 divisors (see below), whose sum is σ = 2038151808. Its totient is φ = 258134912.

The previous prime is 775421657. The next prime is 775421671. The reversal of 775421664 is 466124577.

It is an interprime number because it is at equal distance from previous prime (775421657) and next prime (775421671).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

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, 74509 + ... + 84275.

It is an arithmetic number, because the mean of its divisors is an integer number (42461496).

Almost surely, 2^775421664 is an apocalyptic number.

It is an amenable number.

775421664 is an abundant number, since it is smaller than the sum of its proper divisors (1262730144).

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

775421664 is a wasteful number, since it uses less digits than its factorization.

775421664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607 (or 10599 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 775421664 is about 27846.3940933113. The cubic root of 775421664 is about 918.7118329649.

The spelling of 775421664 in words is "seven hundred seventy-five million, four hundred twenty-one thousand, six hundred sixty-four".