77690145 has 48 divisors (see below), whose sum is σ = 141773760. Its totient is φ = 36211968.

The previous prime is 77690143. The next prime is 77690191. The reversal of 77690145 is 54109677.

It is not a de Polignac number, because 77690145 - 2¹ = 77690143 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (77690143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47359 + ... + 48971.

It is an arithmetic number, because the mean of its divisors is an integer number (2953620).

Almost surely, 2^77690145 is an apocalyptic number.

It is an amenable number.

77690145 is a deficient number, since it is larger than the sum of its proper divisors (64083615).

77690145 is a wasteful number, since it uses less digits than its factorization.

77690145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 77690145 is about 8814.2013251343. The cubic root of 77690145 is about 426.6993461162.

The spelling of 77690145 in words is "seventy-seven million, six hundred ninety thousand, one hundred forty-five".