78281420 has 108 divisors (see below), whose sum is σ = 201230064. Its totient is φ = 25502400.

The previous prime is 78281347. The next prime is 78281431. The reversal of 78281420 is 2418287.

It is a super-2 number, since 2×78281420² = 12255961434432800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 518345 + ... + 518495.

Almost surely, 2^78281420 is an apocalyptic number.

78281420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78281420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100615032).

78281420 is an abundant number, since it is smaller than the sum of its proper divisors (122948644).

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

78281420 is a wasteful number, since it uses less digits than its factorization.

78281420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 78281420 is about 8847.6787916380. The cubic root of 78281420 is about 427.7791025365.

The spelling of 78281420 in words is "seventy-eight million, two hundred eighty-one thousand, four hundred twenty".