81448378 has 16 divisors (see below), whose sum is σ = 134656704. Its totient is φ = 36639360.

The previous prime is 81448369. The next prime is 81448387. The reversal of 81448378 is 87384418.

It is an interprime number because it is at equal distance from previous prime (81448369) and next prime (81448387).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16950 + ... + 21217.

It is an arithmetic number, because the mean of its divisors is an integer number (8416044).

Almost surely, 2^81448378 is an apocalyptic number.

81448378 is a deficient number, since it is larger than the sum of its proper divisors (53208326).

81448378 is a wasteful number, since it uses less digits than its factorization.

81448378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38277.

The product of its digits is 172032, while the sum is 43.

The square root of 81448378 is about 9024.8755116068. The cubic root of 81448378 is about 433.4717641883.

The spelling of 81448378 in words is "eighty-one million, four hundred forty-eight thousand, three hundred seventy-eight".