78766949 has 4 divisors (see below), whose sum is σ = 78937536. Its totient is φ = 78596364.

The previous prime is 78766937. The next prime is 78766999. The reversal of 78766949 is 94966787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78766949 - 2⁸ = 78766693 is a prime.

It is a super-4 number, since 4×78766949⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78766894 and 78766903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78766999) 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, 84599 + ... + 85524.

It is an arithmetic number, because the mean of its divisors is an integer number (19734384).

Almost surely, 2^78766949 is an apocalyptic number.

It is an amenable number.

78766949 is a deficient number, since it is larger than the sum of its proper divisors (170587).

78766949 is a wasteful number, since it uses less digits than its factorization.

78766949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170586.

The product of its digits is 4572288, while the sum is 56.

The square root of 78766949 is about 8875.0745912358. The cubic root of 78766949 is about 428.6616926648.

The spelling of 78766949 in words is "seventy-eight million, seven hundred sixty-six thousand, nine hundred forty-nine".