77640241 has 16 divisors (see below), whose sum is σ = 96142464. Its totient is φ = 61173504.

The previous prime is 77640239. The next prime is 77640247. The reversal of 77640241 is 14204677.

It is not a de Polignac number, because 77640241 - 2¹ = 77640239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77640247) 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, 2470 + ... + 12703.

It is an arithmetic number, because the mean of its divisors is an integer number (6008904).

Almost surely, 2^77640241 is an apocalyptic number.

It is an amenable number.

77640241 is a deficient number, since it is larger than the sum of its proper divisors (18502223).

77640241 is a wasteful number, since it uses less digits than its factorization.

77640241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15240.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 77640241 is about 8811.3699842873. The cubic root of 77640241 is about 426.6079635898.

The spelling of 77640241 in words is "seventy-seven million, six hundred forty thousand, two hundred forty-one".