77678201 has 4 divisors (see below), whose sum is σ = 77764752. Its totient is φ = 77591652.

The previous prime is 77678177. The next prime is 77678203. The reversal of 77678201 is 10287677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10287677 = 2731 ⋅3767.

It is a cyclic number.

It is not a de Polignac number, because 77678201 - 2¹⁰ = 77677177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77678203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41915 + ... + 43728.

It is an arithmetic number, because the mean of its divisors is an integer number (19441188).

Almost surely, 2^77678201 is an apocalyptic number.

It is an amenable number.

77678201 is a deficient number, since it is larger than the sum of its proper divisors (86551).

77678201 is an equidigital number, since it uses as much as digits as its factorization.

77678201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86550.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 77678201 is about 8813.5237561375. The cubic root of 77678201 is about 426.6774782281.

The spelling of 77678201 in words is "seventy-seven million, six hundred seventy-eight thousand, two hundred one".