7870820 has 12 divisors (see below), whose sum is σ = 16528764. Its totient is φ = 3148320.

The previous prime is 7870817. The next prime is 7870823. The reversal of 7870820 is 280787.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7870817) and next prime (7870823).

It can be written as a sum of positive squares in 2 ways, for example, as 5721664 + 2149156 = 2392^2 + 1466^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7870823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196751 + ... + 196790.

It is an arithmetic number, because the mean of its divisors is an integer number (1377397).

Almost surely, 2^7870820 is an apocalyptic number.

It is an amenable number.

7870820 is an abundant number, since it is smaller than the sum of its proper divisors (8657944).

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

7870820 is a wasteful number, since it uses less digits than its factorization.

7870820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393550 (or 393548 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 7870820 is about 2805.4981732306. The cubic root of 7870820 is about 198.9176531931.

The spelling of 7870820 in words is "seven million, eight hundred seventy thousand, eight hundred twenty".