80078749 has 4 divisors (see below), whose sum is σ = 84293440. Its totient is φ = 75864060.

The previous prime is 80078743. The next prime is 80078777. The reversal of 80078749 is 94787008.

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 80078749 - 2⁵ = 80078717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80078743) 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, 2107317 + ... + 2107354.

It is an arithmetic number, because the mean of its divisors is an integer number (21073360).

Almost surely, 2^80078749 is an apocalyptic number.

It is an amenable number.

80078749 is a deficient number, since it is larger than the sum of its proper divisors (4214691).

80078749 is a wasteful number, since it uses less digits than its factorization.

80078749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214690.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 80078749 is about 8948.6730301202. The cubic root of 80078749 is about 431.0282746222.

The spelling of 80078749 in words is "eighty million, seventy-eight thousand, seven hundred forty-nine".