290138624 has 20 divisors (see below), whose sum is σ = 579711594. Its totient is φ = 145069056.

The previous prime is 290138623. The next prime is 290138657. The reversal of 290138624 is 426831092.

It can be written as a sum of positive squares in only one way, i.e., 219040000 + 71098624 = 14800^2 + 8432^2 .

It is a super-2 number, since 2×290138624² = 168360842273226752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (290138623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282827 + ... + 283850.

Almost surely, 2^290138624 is an apocalyptic number.

It is an amenable number.

290138624 is a deficient number, since it is larger than the sum of its proper divisors (289572970).

290138624 is an frugal number, since it uses more digits than its factorization.

290138624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566695 (or 566679 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 290138624 is about 17033.4560204323. The cubic root of 290138624 is about 662.0160454668.

The spelling of 290138624 in words is "two hundred ninety million, one hundred thirty-eight thousand, six hundred twenty-four".