77795775 has 48 divisors (see below), whose sum is σ = 149157120. Its totient is φ = 39679200.

The previous prime is 77795761. The next prime is 77795779. The reversal of 77795775 is 57759777.

It is a happy number.

It is not a de Polignac number, because 77795775 - 2¹⁴ = 77779391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77795779) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13020 + ... + 18030.

It is an arithmetic number, because the mean of its divisors is an integer number (3107440).

Almost surely, 2^77795775 is an apocalyptic number.

77795775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

77795775 is a deficient number, since it is larger than the sum of its proper divisors (71361345).

77795775 is a wasteful number, since it uses less digits than its factorization.

77795775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053 (or 5042 counting only the distinct ones).

The product of its digits is 3781575, while the sum is 54.

The square root of 77795775 is about 8820.1913244555. The cubic root of 77795775 is about 426.8926432202.

The spelling of 77795775 in words is "seventy-seven million, seven hundred ninety-five thousand, seven hundred seventy-five".