290689240 has 32 divisors (see below), whose sum is σ = 661938480. Its totient is φ = 114873472.

The previous prime is 290689237. The next prime is 290689253. The reversal of 290689240 is 42986092.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 290689193 and 290689202.

It is a congruent number.

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, 40459 + ... + 47098.

Almost surely, 2^290689240 is an apocalyptic number.

290689240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

290689240 is an abundant number, since it is smaller than the sum of its proper divisors (371249240).

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

290689240 is a wasteful number, since it uses less digits than its factorization.

290689240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87651 (or 87647 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 290689240 is about 17049.6111392606. The cubic root of 290689240 is about 662.4345652710.

The spelling of 290689240 in words is "two hundred ninety million, six hundred eighty-nine thousand, two hundred forty".