261485490 has 32 divisors (see below), whose sum is σ = 717217920. Its totient is φ = 59768064.

The previous prime is 261485473. The next prime is 261485501. The reversal of 261485490 is 94584162.

It is a super-2 number, since 2×261485490² = 136749322961080200, which contains 22 as substring.

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, 622375 + ... + 622794.

It is an arithmetic number, because the mean of its divisors is an integer number (22413060).

Almost surely, 2^261485490 is an apocalyptic number.

261485490 is an abundant number, since it is smaller than the sum of its proper divisors (455732430).

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

261485490 is a wasteful number, since it uses less digits than its factorization.

261485490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245186.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 261485490 is about 16170.5129788761. The cubic root of 261485490 is about 639.4636538357.

The spelling of 261485490 in words is "two hundred sixty-one million, four hundred eighty-five thousand, four hundred ninety".