290123428 has 24 divisors (see below), whose sum is σ = 614380032. Its totient is φ = 117024384.

The previous prime is 290123419. The next prime is 290123459. The reversal of 290123428 is 824321092.

It is a self number, because there is not a number n which added to its sum of digits gives 290123428.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304276 + ... + 305227.

It is an arithmetic number, because the mean of its divisors is an integer number (25599168).

Almost surely, 2^290123428 is an apocalyptic number.

290123428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

290123428 is an abundant number, since it is smaller than the sum of its proper divisors (324256604).

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

290123428 is a wasteful number, since it uses less digits than its factorization.

290123428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609531 (or 609529 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 290123428 is about 17033.0099512682. The cubic root of 290123428 is about 662.0044875762.

The spelling of 290123428 in words is "two hundred ninety million, one hundred twenty-three thousand, four hundred twenty-eight".