7861408278 has 32 divisors (see below), whose sum is σ = 16238050560. Its totient is φ = 2535389280.

The previous prime is 7861408259. The next prime is 7861408279. The reversal of 7861408278 is 8728041687.

It is a super-2 number, since 2×7861408278² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7861408278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861408279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59178 + ... + 138653.

It is an arithmetic number, because the mean of its divisors is an integer number (507439080).

Almost surely, 2^7861408278 is an apocalyptic number.

7861408278 is an abundant number, since it is smaller than the sum of its proper divisors (8376642282).

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

7861408278 is a wasteful number, since it uses less digits than its factorization.

7861408278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198052.

The product of its (nonzero) digits is 1204224, while the sum is 51.

The square root of 7861408278 is about 88664.5829968201. The cubic root of 7861408278 is about 1988.3833471574.

The spelling of 7861408278 in words is "seven billion, eight hundred sixty-one million, four hundred eight thousand, two hundred seventy-eight".