770134638 has 128 divisors (see below), whose sum is σ = 2029870080. Its totient is φ = 189112320.

The previous prime is 770134633. The next prime is 770134669. The reversal of 770134638 is 836431077.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 770134596 and 770134605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (770134633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 632206 + ... + 633422.

It is an arithmetic number, because the mean of its divisors is an integer number (15858360).

Almost surely, 2^770134638 is an apocalyptic number.

770134638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 770134638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014935040).

770134638 is an abundant number, since it is smaller than the sum of its proper divisors (1259735442).

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

770134638 is a wasteful number, since it uses less digits than its factorization.

770134638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 770134638 is about 27751.2997533449. The cubic root of 770134638 is about 916.6190642094.

The spelling of 770134638 in words is "seven hundred seventy million, one hundred thirty-four thousand, six hundred thirty-eight".