77690238 has 16 divisors (see below), whose sum is σ = 164520720. Its totient is φ = 24373376.

The previous prime is 77690231. The next prime is 77690257. The reversal of 77690238 is 83209677.

It is a super-3 number, since 3×77690238³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77690238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77690231) 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, 380733 + ... + 380936.

It is an arithmetic number, because the mean of its divisors is an integer number (10282545).

Almost surely, 2^77690238 is an apocalyptic number.

77690238 is an abundant number, since it is smaller than the sum of its proper divisors (86830482).

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

77690238 is a wasteful number, since it uses less digits than its factorization.

77690238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761691.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 77690238 is about 8814.2066007100. The cubic root of 77690238 is about 426.6995163781.

The spelling of 77690238 in words is "seventy-seven million, six hundred ninety thousand, two hundred thirty-eight".