775623420 has 144 divisors (see below), whose sum is σ = 2764131552. Its totient is φ = 173560320.

The previous prime is 775623413. The next prime is 775623421. The reversal of 775623420 is 24326577.

It is a happy number.

775623420 is a `hidden beast` number, since 7 + 7 + 5 + 623 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775623421) 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 47 ways as a sum of consecutive naturals, for example, 10674 + ... + 40806.

It is an arithmetic number, because the mean of its divisors is an integer number (19195358).

Almost surely, 2^775623420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775623420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382065776).

775623420 is an abundant number, since it is smaller than the sum of its proper divisors (1988508132).

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

775623420 is a wasteful number, since it uses less digits than its factorization.

775623420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30172 (or 30167 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 775623420 is about 27850.0165170508. The cubic root of 775623420 is about 918.7915055524.

Adding to 775623420 its reverse (24326577), we get a palindrome (799949997).

The spelling of 775623420 in words is "seven hundred seventy-five million, six hundred twenty-three thousand, four hundred twenty".