78002281 has 8 divisors (see below), whose sum is σ = 91042560. Its totient is φ = 65436288.

The previous prime is 78002279. The next prime is 78002291. The reversal of 78002281 is 18220087.

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

It is a cyclic number.

It is not a de Polignac number, because 78002281 - 2¹ = 78002279 is a prime.

It is a super-2 number, since 2×78002281² = 12168711682405922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78002291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118216 + ... + 118873.

It is an arithmetic number, because the mean of its divisors is an integer number (11380320).

Almost surely, 2^78002281 is an apocalyptic number.

It is an amenable number.

78002281 is a deficient number, since it is larger than the sum of its proper divisors (13040279).

78002281 is a wasteful number, since it uses less digits than its factorization.

78002281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237143.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 78002281 is about 8831.8900015795. The cubic root of 78002281 is about 427.2700330584.

The spelling of 78002281 in words is "seventy-eight million, two thousand, two hundred eighty-one".