78206420 has 24 divisors (see below), whose sum is σ = 166687584. Its totient is φ = 30815136.

The previous prime is 78206399. The next prime is 78206423. The reversal of 78206420 is 2460287.

It is a super-2 number, since 2×78206420² = 12232488258432800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78206423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27842 + ... + 30521.

It is an arithmetic number, because the mean of its divisors is an integer number (6945316).

Almost surely, 2^78206420 is an apocalyptic number.

It is an amenable number.

78206420 is an abundant number, since it is smaller than the sum of its proper divisors (88481164).

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

78206420 is a wasteful number, since it uses less digits than its factorization.

78206420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58439 (or 58437 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 78206420 is about 8843.4393761703. The cubic root of 78206420 is about 427.6424430996.

The spelling of 78206420 in words is "seventy-eight million, two hundred six thousand, four hundred twenty".