1278200928 has 48 divisors (see below), whose sum is σ = 3463520256. Its totient is φ = 412321920.

The previous prime is 1278200923. The next prime is 1278200933. The reversal of 1278200928 is 8290028721.

It is an interprime number because it is at equal distance from previous prime (1278200923) and next prime (1278200933).

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

It is a super-2 number, since 2×1278200928² = 3267595224680122368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278200923) 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, 211776 + ... + 217727.

It is an arithmetic number, because the mean of its divisors is an integer number (72156672).

Almost surely, 2^1278200928 is an apocalyptic number.

It is an amenable number.

1278200928 is an abundant number, since it is smaller than the sum of its proper divisors (2185319328).

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

1278200928 is a wasteful number, since it uses less digits than its factorization.

1278200928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429547 (or 429539 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1278200928 is about 35751.9360035229. The cubic root of 1278200928 is about 1085.2581172164.

The spelling of 1278200928 in words is "one billion, two hundred seventy-eight million, two hundred thousand, nine hundred twenty-eight".