77000731 has 4 divisors (see below), whose sum is σ = 77720472. Its totient is φ = 76280992.

The previous prime is 77000719. The next prime is 77000779. The reversal of 77000731 is 13700077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13700077 = 47 ⋅291491.

It is a cyclic number.

It is not a de Polignac number, because 77000731 - 2⁵ = 77000699 is a prime.

It is a super-2 number, since 2×77000731² = 11858225149068722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77000696 and 77000705.

It is not an unprimeable number, because it can be changed into a prime (77090731) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 359710 + ... + 359923.

It is an arithmetic number, because the mean of its divisors is an integer number (19430118).

Almost surely, 2^77000731 is an apocalyptic number.

77000731 is a deficient number, since it is larger than the sum of its proper divisors (719741).

77000731 is a wasteful number, since it uses less digits than its factorization.

77000731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719740.

The product of its (nonzero) digits is 1029, while the sum is 25.

The square root of 77000731 is about 8775.0060398840. The cubic root of 77000731 is about 425.4334327880.

The spelling of 77000731 in words is "seventy-seven million, seven hundred thirty-one", and thus it is an aban number.