84780340 has 24 divisors (see below), whose sum is σ = 184179240. Its totient is φ = 32742528.

The previous prime is 84780331. The next prime is 84780349. The reversal of 84780340 is 4308748.

It is an interprime number because it is at equal distance from previous prime (84780331) and next prime (84780349).

It can be written as a sum of positive squares in 4 ways, for example, as 12802084 + 71978256 = 3578^2 + 8484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84780296 and 84780305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84780349) 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, 72507 + ... + 73666.

It is an arithmetic number, because the mean of its divisors is an integer number (7674135).

Almost surely, 2^84780340 is an apocalyptic number.

It is an amenable number.

84780340 is an abundant number, since it is smaller than the sum of its proper divisors (99398900).

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

84780340 is a wasteful number, since it uses less digits than its factorization.

84780340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146211 (or 146209 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 84780340 is about 9207.6240149129. The cubic root of 84780340 is about 439.3038924079.

The spelling of 84780340 in words is "eighty-four million, seven hundred eighty thousand, three hundred forty".