291084428 has 6 divisors (see below), whose sum is σ = 509397756. Its totient is φ = 145542212.

The previous prime is 291084407. The next prime is 291084433. The reversal of 291084428 is 824480192.

It is a junction number, because it is equal to n+sod(n) for n = 291084391 and 291084400.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36385550 + ... + 36385557.

It is an arithmetic number, because the mean of its divisors is an integer number (84899626).

Almost surely, 2^291084428 is an apocalyptic number.

It is an amenable number.

291084428 is a deficient number, since it is larger than the sum of its proper divisors (218313328).

291084428 is a wasteful number, since it uses less digits than its factorization.

291084428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72771111 (or 72771109 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 291084428 is about 17061.1965582722. The cubic root of 291084428 is about 662.7346195476.

The spelling of 291084428 in words is "two hundred ninety-one million, eighty-four thousand, four hundred twenty-eight".