77381746 has 8 divisors (see below), whose sum is σ = 125001324. Its totient is φ = 35714640.

The previous prime is 77381723. The next prime is 77381761. The reversal of 77381746 is 64718377.

It can be written as a sum of positive squares in 2 ways, for example, as 55338721 + 22043025 = 7439^2 + 4695^2 .

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

It is a super-2 number, since 2×77381746² = 11975869228017032, which contains 22 as substring.

It is an unprimeable number.

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, 1488085 + ... + 1488136.

Almost surely, 2^77381746 is an apocalyptic number.

77381746 is a deficient number, since it is larger than the sum of its proper divisors (47619578).

77381746 is a wasteful number, since it uses less digits than its factorization.

77381746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976236.

The product of its digits is 197568, while the sum is 43.

The square root of 77381746 is about 8796.6894909392. The cubic root of 77381746 is about 426.1339884315.

The spelling of 77381746 in words is "seventy-seven million, three hundred eighty-one thousand, seven hundred forty-six".