1278725533 has 8 divisors (see below), whose sum is σ = 1367091648. Its totient is φ = 1191820224.

The previous prime is 1278725527. The next prime is 1278725557. The reversal of 1278725533 is 3355278721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1278725533 - 2¹⁷ = 1278594461 is a prime.

It is a super-2 number, since 2×1278725533² = 3270277977492268178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278725533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278725563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363391 + ... + 366892.

It is an arithmetic number, because the mean of its divisors is an integer number (170886456).

Almost surely, 2^1278725533 is an apocalyptic number.

It is an amenable number.

1278725533 is a deficient number, since it is larger than the sum of its proper divisors (88366115).

1278725533 is a wasteful number, since it uses less digits than its factorization.

1278725533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730403.

The product of its digits is 352800, while the sum is 43.

The square root of 1278725533 is about 35759.2719864373. The cubic root of 1278725533 is about 1085.4065690887.

The spelling of 1278725533 in words is "one billion, two hundred seventy-eight million, seven hundred twenty-five thousand, five hundred thirty-three".