278644728102 has 64 divisors (see below), whose sum is σ = 606918057984. Its totient is φ = 84776492160.

The previous prime is 278644728097. The next prime is 278644728107. The reversal of 278644728102 is 201827446872.

It is an interprime number because it is at equal distance from previous prime (278644728097) and next prime (278644728107).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278644728107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2431968 + ... + 2543964.

It is an arithmetic number, because the mean of its divisors is an integer number (9483094656).

Almost surely, 2^278644728102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278644728102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303459028992).

278644728102 is an abundant number, since it is smaller than the sum of its proper divisors (328273329882).

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

278644728102 is a wasteful number, since it uses less digits than its factorization.

278644728102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112373.

The product of its (nonzero) digits is 2408448, while the sum is 51.

The spelling of 278644728102 in words is "two hundred seventy-eight billion, six hundred forty-four million, seven hundred twenty-eight thousand, one hundred two".