278911790641 has 27 divisors (see below), whose sum is σ = 314500790667. Its totient is φ = 247160628000.

The previous prime is 278911790587. The next prime is 278911790681. The reversal of 278911790641 is 146097119872.

It is a happy number.

The square root of 278911790641 is 528121.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13439533041 + 265472257600 = 115929^2 + 515240^2 .

It is not a de Polignac number, because 278911790641 - 2³¹ = 276764306993 is a prime.

It is a super-3 number, since 3×278911790641³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278911790681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 238181986 + ... + 238183156.

Almost surely, 2^278911790641 is an apocalyptic number.

278911790641 is the 528121-st square number.

278911790641 is the 264061-st centered octagonal number.

It is an amenable number.

278911790641 is a deficient number, since it is larger than the sum of its proper divisors (35589000026).

278911790641 is an frugal number, since it uses more digits than its factorization.

278911790641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 278911790641 in words is "two hundred seventy-eight billion, nine hundred eleven million, seven hundred ninety thousand, six hundred forty-one".