279966308640 has 48 divisors (see below), whose sum is σ = 881893873728. Its totient is φ = 74657682176.

The previous prime is 279966308597. The next prime is 279966308711. The reversal of 279966308640 is 46803669972.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×279966308640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291631092 + ... + 291632051.

It is an arithmetic number, because the mean of its divisors is an integer number (18372789036).

Almost surely, 2^279966308640 is an apocalyptic number.

279966308640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

279966308640 is an abundant number, since it is smaller than the sum of its proper divisors (601927565088).

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

279966308640 is a wasteful number, since it uses less digits than its factorization.

279966308640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583263161 (or 583263153 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 279966308640 in words is "two hundred seventy-nine billion, nine hundred sixty-six million, three hundred eight thousand, six hundred forty".