78434020 has 24 divisors (see below), whose sum is σ = 188241984. Its totient is φ = 26891616.

The previous prime is 78434003. The next prime is 78434029. The reversal of 78434020 is 2043487.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 78434020.

It is not an unprimeable number, because it can be changed into a prime (78434029) 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, 279982 + ... + 280261.

It is an arithmetic number, because the mean of its divisors is an integer number (7843416).

Almost surely, 2^78434020 is an apocalyptic number.

78434020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78434020 is an abundant number, since it is smaller than the sum of its proper divisors (109807964).

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

78434020 is a wasteful number, since it uses less digits than its factorization.

78434020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560259 (or 560257 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 78434020 is about 8856.2983237919. The cubic root of 78434020 is about 428.0568896924.

The spelling of 78434020 in words is "seventy-eight million, four hundred thirty-four thousand, twenty".