77728201 has 4 divisors (see below), whose sum is σ = 81107712. Its totient is φ = 74348692.

The previous prime is 77728187. The next prime is 77728237. The reversal of 77728201 is 10282777.

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: 10282777 = 557 ⋅18461.

It is a cyclic number.

It is not a de Polignac number, because 77728201 - 2⁷ = 77728073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77728291) 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, 1689721 + ... + 1689766.

It is an arithmetic number, because the mean of its divisors is an integer number (20276928).

Almost surely, 2^77728201 is an apocalyptic number.

It is an amenable number.

77728201 is a deficient number, since it is larger than the sum of its proper divisors (3379511).

77728201 is a wasteful number, since it uses less digits than its factorization.

77728201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379510.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 77728201 is about 8816.3598497339. The cubic root of 77728201 is about 426.7690066873.

The spelling of 77728201 in words is "seventy-seven million, seven hundred twenty-eight thousand, two hundred one".