77774401 has 4 divisors (see below), whose sum is σ = 79583152. Its totient is φ = 75965652.

The previous prime is 77774377. The next prime is 77774413. The reversal of 77774401 is 10447777.

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: 10447777 = 19 ⋅549883.

It is a cyclic number.

It is not a de Polignac number, because 77774401 - 2⁵ = 77774369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77774441) 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, 904311 + ... + 904396.

It is an arithmetic number, because the mean of its divisors is an integer number (19895788).

Almost surely, 2^77774401 is an apocalyptic number.

It is an amenable number.

77774401 is a deficient number, since it is larger than the sum of its proper divisors (1808751).

77774401 is a wasteful number, since it uses less digits than its factorization.

77774401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808750.

The product of its (nonzero) digits is 38416, while the sum is 37.

The square root of 77774401 is about 8818.9795894990. The cubic root of 77774401 is about 426.8535440999.

The spelling of 77774401 in words is "seventy-seven million, seven hundred seventy-four thousand, four hundred one".