80421878 has 8 divisors (see below), whose sum is σ = 120937872. Its totient is φ = 40109256.

The previous prime is 80421871. The next prime is 80421923. The reversal of 80421878 is 87812408.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×80421878² = 12935356922093768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80421871) 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, 49850 + ... + 51437.

It is an arithmetic number, because the mean of its divisors is an integer number (15117234).

Almost surely, 2^80421878 is an apocalyptic number.

80421878 is a deficient number, since it is larger than the sum of its proper divisors (40515994).

80421878 is a wasteful number, since it uses less digits than its factorization.

80421878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101686.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 80421878 is about 8967.8245968574. The cubic root of 80421878 is about 431.6430343066.

It can be divided in two parts, 8042187 and 8, that multiplied together give a triangular number (64337496 = T₁₁₃₄₃).

The spelling of 80421878 in words is "eighty million, four hundred twenty-one thousand, eight hundred seventy-eight".