77311730 has 16 divisors (see below), whose sum is σ = 139762584. Its totient is φ = 30791040.

The previous prime is 77311681. The next prime is 77311739. The reversal of 77311730 is 3711377.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48678529 + 28633201 = 6977^2 + 5351^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77311693 and 77311702.

It is not an unprimeable number, because it can be changed into a prime (77311739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14261 + ... + 18920.

Almost surely, 2^77311730 is an apocalyptic number.

77311730 is a deficient number, since it is larger than the sum of its proper divisors (62450854).

77311730 is a wasteful number, since it uses less digits than its factorization.

77311730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33421.

The product of its (nonzero) digits is 3087, while the sum is 29.

The square root of 77311730 is about 8792.7089113651. The cubic root of 77311730 is about 426.0054258091.

The spelling of 77311730 in words is "seventy-seven million, three hundred eleven thousand, seven hundred thirty".