77543641 has 16 divisors (see below), whose sum is σ = 90547200. Its totient is φ = 65032848.

The previous prime is 77543633. The next prime is 77543677. The reversal of 77543641 is 14634577.

It is a cyclic number.

It is not a de Polignac number, because 77543641 - 2³ = 77543633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77543641.

It is not an unprimeable number, because it can be changed into a prime (77543621) 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, 148006 + ... + 148528.

It is an arithmetic number, because the mean of its divisors is an integer number (5659200).

Almost surely, 2^77543641 is an apocalyptic number.

It is an amenable number.

77543641 is a deficient number, since it is larger than the sum of its proper divisors (13003559).

77543641 is a wasteful number, since it uses less digits than its factorization.

77543641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948.

The product of its digits is 70560, while the sum is 37.

The square root of 77543641 is about 8805.8867242317. The cubic root of 77543641 is about 426.4309615959.

The spelling of 77543641 in words is "seventy-seven million, five hundred forty-three thousand, six hundred forty-one".