77864953 has 4 divisors (see below), whose sum is σ = 77935780. Its totient is φ = 77794128.

The previous prime is 77864911. The next prime is 77864957. The reversal of 77864953 is 35946877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35946877 = 157 ⋅228961.

It can be written as a sum of positive squares in 2 ways, for example, as 1774224 + 76090729 = 1332^2 + 8723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77864953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77864897 and 77864906.

It is not an unprimeable number, because it can be changed into a prime (77864957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33738 + ... + 35971.

It is an arithmetic number, because the mean of its divisors is an integer number (19483945).

Almost surely, 2^77864953 is an apocalyptic number.

It is an amenable number.

77864953 is a deficient number, since it is larger than the sum of its proper divisors (70827).

77864953 is a wasteful number, since it uses less digits than its factorization.

77864953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70826.

The product of its digits is 1270080, while the sum is 49.

The square root of 77864953 is about 8824.1120233143. The cubic root of 77864953 is about 427.0191403648.

The spelling of 77864953 in words is "seventy-seven million, eight hundred sixty-four thousand, nine hundred fifty-three".