1077278891 has 16 divisors (see below), whose sum is σ = 1224804000. Its totient is φ = 939299328.

The previous prime is 1077278887. The next prime is 1077278911. The reversal of 1077278891 is 1988727701.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1077278891 - 2² = 1077278887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1077278821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79955 + ... + 92451.

It is an arithmetic number, because the mean of its divisors is an integer number (76550250).

Almost surely, 2^1077278891 is an apocalyptic number.

1077278891 is a deficient number, since it is larger than the sum of its proper divisors (147525109).

1077278891 is a wasteful number, since it uses less digits than its factorization.

1077278891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12878.

The product of its (nonzero) digits is 395136, while the sum is 50.

The square root of 1077278891 is about 32821.9269848679. The cubic root of 1077278891 is about 1025.1231709211.

The spelling of 1077278891 in words is "one billion, seventy-seven million, two hundred seventy-eight thousand, eight hundred ninety-one".