775989390 has 64 divisors (see below), whose sum is σ = 2039634432. Its totient is φ = 187382400.

The previous prime is 775989353. The next prime is 775989391. The reversal of 775989390 is 93989577.

It is a self number, because there is not a number n which added to its sum of digits gives 775989390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775989391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82320 + ... + 91260.

It is an arithmetic number, because the mean of its divisors is an integer number (31869288).

Almost surely, 2^775989390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775989390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019817216).

775989390 is an abundant number, since it is smaller than the sum of its proper divisors (1263645042).

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

775989390 is a wasteful number, since it uses less digits than its factorization.

775989390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9225.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The square root of 775989390 is about 27856.5861153157. The cubic root of 775989390 is about 918.9359902972.

The spelling of 775989390 in words is "seven hundred seventy-five million, nine hundred eighty-nine thousand, three hundred ninety".