77942385 has 16 divisors (see below), whose sum is σ = 138564480. Its totient is φ = 41569200.

The previous prime is 77942341. The next prime is 77942393. The reversal of 77942385 is 58324977.

It is not a de Polignac number, because 77942385 - 2⁷ = 77942257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 77942385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288541 + ... + 288810.

It is an arithmetic number, because the mean of its divisors is an integer number (8660280).

Almost surely, 2^77942385 is an apocalyptic number.

It is an amenable number.

77942385 is a deficient number, since it is larger than the sum of its proper divisors (60622095).

77942385 is a wasteful number, since it uses less digits than its factorization.

77942385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577365 (or 577359 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 77942385 is about 8828.4984567026. The cubic root of 77942385 is about 427.1606417313.

The spelling of 77942385 in words is "seventy-seven million, nine hundred forty-two thousand, three hundred eighty-five".