770638642 has 4 divisors (see below), whose sum is σ = 1155957966. Its totient is φ = 385319320.

The previous prime is 770638639. The next prime is 770638691. The reversal of 770638642 is 246836077.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 693216241 + 77422401 = 26329^2 + 8799^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192659659 + ... + 192659662.

Almost surely, 2^770638642 is an apocalyptic number.

770638642 is a deficient number, since it is larger than the sum of its proper divisors (385319324).

770638642 is a wasteful number, since it uses less digits than its factorization.

770638642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385319323.

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 770638642 is about 27760.3789959719. The cubic root of 770638642 is about 916.8189768437.

The spelling of 770638642 in words is "seven hundred seventy million, six hundred thirty-eight thousand, six hundred forty-two".