2891434860 has 48 divisors (see below), whose sum is σ = 8995576800. Its totient is φ = 771049152.

The previous prime is 2891434789. The next prime is 2891434921. The reversal of 2891434860 is 684341982.

It is a happy number.

2891434860 is a `hidden beast` number, since 28 + 9 + 143 + 486 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2676715 + ... + 2677794.

It is an arithmetic number, because the mean of its divisors is an integer number (187407850).

Almost surely, 2^2891434860 is an apocalyptic number.

2891434860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2891434860 is an abundant number, since it is smaller than the sum of its proper divisors (6104141940).

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

2891434860 is a wasteful number, since it uses less digits than its factorization.

2891434860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5354527 (or 5354519 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 2891434860 is about 53772.0639365833. The cubic root of 2891434860 is about 1424.6378248556.

The spelling of 2891434860 in words is "two billion, eight hundred ninety-one million, four hundred thirty-four thousand, eight hundred sixty".