77242505 has 16 divisors (see below), whose sum is σ = 99230400. Its totient is φ = 57545280.

The previous prime is 77242499. The next prime is 77242507. The reversal of 77242505 is 50524277.

It is not a de Polignac number, because 77242505 - 2¹⁸ = 76980361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77242507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1286 + ... + 12495.

It is an arithmetic number, because the mean of its divisors is an integer number (6201900).

Almost surely, 2^77242505 is an apocalyptic number.

It is an amenable number.

77242505 is a deficient number, since it is larger than the sum of its proper divisors (21987895).

77242505 is a wasteful number, since it uses less digits than its factorization.

77242505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13864.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 77242505 is about 8788.7715296280. The cubic root of 77242505 is about 425.8782392797.

The spelling of 77242505 in words is "seventy-seven million, two hundred forty-two thousand, five hundred five".