77869930 has 16 divisors (see below), whose sum is σ = 144999720. Its totient is φ = 30073792.

The previous prime is 77869921. The next prime is 77869931. The reversal of 77869930 is 3996877.

It can be written as a sum of positive squares in 4 ways, for example, as 73977201 + 3892729 = 8601^2 + 1973^2 .

It is not an unprimeable number, because it can be changed into a prime (77869931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133969 + ... + 134548.

Almost surely, 2^77869930 is an apocalyptic number.

77869930 is a deficient number, since it is larger than the sum of its proper divisors (67129790).

77869930 is a wasteful number, since it uses less digits than its factorization.

77869930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268553.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 77869930 is about 8824.3940301870. The cubic root of 77869930 is about 427.0282382918.

The spelling of 77869930 in words is "seventy-seven million, eight hundred sixty-nine thousand, nine hundred thirty".