77078401 has 4 divisors (see below), whose sum is σ = 78958404. Its totient is φ = 75198400.

The previous prime is 77078399. The next prime is 77078411. The reversal of 77078401 is 10487077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8271376 + 68807025 = 2876^2 + 8295^2 .

It is a cyclic number.

It is not a de Polignac number, because 77078401 - 2¹ = 77078399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77078411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939940 + ... + 940021.

It is an arithmetic number, because the mean of its divisors is an integer number (19739601).

Almost surely, 2^77078401 is an apocalyptic number.

It is an amenable number.

77078401 is a deficient number, since it is larger than the sum of its proper divisors (1880003).

77078401 is a wasteful number, since it uses less digits than its factorization.

77078401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880002.

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

The square root of 77078401 is about 8779.4305623998. The cubic root of 77078401 is about 425.5764284467.

The spelling of 77078401 in words is "seventy-seven million, seventy-eight thousand, four hundred one".