77700770 has 24 divisors (see below), whose sum is σ = 162696924. Its totient is φ = 26640096.

The previous prime is 77700769. The next prime is 77700793. The reversal of 77700770 is 7700777.

It can be written as a sum of positive squares in 2 ways, for example, as 71385601 + 6315169 = 8449^2 + 2513^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 77700770.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78797 + ... + 79776.

Almost surely, 2^77700770 is an apocalyptic number.

77700770 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77700770 is an abundant number, since it is smaller than the sum of its proper divisors (84996154).

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

77700770 is a wasteful number, since it uses less digits than its factorization.

77700770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158594 (or 158587 counting only the distinct ones).

The product of its (nonzero) digits is 16807, while the sum is 35.

The square root of 77700770 is about 8814.8040250479. The cubic root of 77700770 is about 426.7187972057.

The spelling of 77700770 in words is "seventy-seven million, seven hundred thousand, seven hundred seventy".