77238261 has 12 divisors (see below), whose sum is σ = 113396140. Its totient is φ = 50647680.

The previous prime is 77238251. The next prime is 77238263. The reversal of 77238261 is 16283277.

It can be written as a sum of positive squares in 2 ways, for example, as 43956900 + 33281361 = 6630^2 + 5769^2 .

It is not a de Polignac number, because 77238261 - 2⁶ = 77238197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77238263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69796 + ... + 70893.

Almost surely, 2^77238261 is an apocalyptic number.

It is an amenable number.

77238261 is a deficient number, since it is larger than the sum of its proper divisors (36157879).

77238261 is a wasteful number, since it uses less digits than its factorization.

77238261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140756 (or 140753 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 77238261 is about 8788.5300818738. The cubic root of 77238261 is about 425.8704393413.

The spelling of 77238261 in words is "seventy-seven million, two hundred thirty-eight thousand, two hundred sixty-one".