80078778 has 48 divisors (see below), whose sum is σ = 194987520. Its totient is φ = 23566752.

The previous prime is 80078777. The next prime is 80078783. The reversal of 80078778 is 87787008.

It is a super-2 number, since 2×80078778² = 12825221371946568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80078777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2058 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (4062240).

Almost surely, 2^80078778 is an apocalyptic number.

80078778 is an abundant number, since it is smaller than the sum of its proper divisors (114908742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80078778 is a wasteful number, since it uses less digits than its factorization.

80078778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14923 (or 14920 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 80078778 is about 8948.6746504720. The cubic root of 80078778 is about 431.0283266536.

The spelling of 80078778 in words is "eighty million, seventy-eight thousand, seven hundred seventy-eight".