77400005 has 8 divisors (see below), whose sum is σ = 95145624. Its totient is φ = 60409600.

The previous prime is 77399999. The next prime is 77400017. The reversal of 77400005 is 50000477.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 784996 + 76615009 = 886^2 + 8753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77400005 - 2¹² = 77395909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188576 + ... + 188985.

It is an arithmetic number, because the mean of its divisors is an integer number (11893203).

Almost surely, 2^77400005 is an apocalyptic number.

It is an amenable number.

77400005 is a deficient number, since it is larger than the sum of its proper divisors (17745619).

77400005 is a wasteful number, since it uses less digits than its factorization.

77400005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377607.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 77400005 is about 8797.7272633334. The cubic root of 77400005 is about 426.1675026602.

The spelling of 77400005 in words is "seventy-seven million, four hundred thousand, five".