77781933 has 12 divisors (see below), whose sum is σ = 112467420. Its totient is φ = 51801216.

The previous prime is 77781931. The next prime is 77781937. The reversal of 77781933 is 33918777.

It can be written as a sum of positive squares in 2 ways, for example, as 37675044 + 40106889 = 6138^2 + 6333^2 .

It is not a de Polignac number, because 77781933 - 2¹ = 77781931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77781931) 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, 6085 + ... + 13877.

It is an arithmetic number, because the mean of its divisors is an integer number (9372285).

Almost surely, 2^77781933 is an apocalyptic number.

It is an amenable number.

77781933 is a deficient number, since it is larger than the sum of its proper divisors (34685487).

77781933 is a wasteful number, since it uses less digits than its factorization.

77781933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908 (or 8905 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 77781933 is about 8819.4066126923. The cubic root of 77781933 is about 426.8673230857.

The spelling of 77781933 in words is "seventy-seven million, seven hundred eighty-one thousand, nine hundred thirty-three".