385221650 has 72 divisors (see below), whose sum is σ = 807299892. Its totient is φ = 136576000.

The previous prime is 385221611. The next prime is 385221671. The reversal of 385221650 is 56122583.

385221650 = T₂₄₄₁ + T₂₄₄₂ + ... + T₂₅₆₃.

It can be written as a sum of positive squares in 6 ways, for example, as 6568969 + 378652681 = 2563^2 + 19459^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 247274 + ... + 248826.

Almost surely, 2^385221650 is an apocalyptic number.

385221650 is an abundant number, since it is smaller than the sum of its proper divisors (422078242).

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

385221650 is a wasteful number, since it uses less digits than its factorization.

385221650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 385221650 is about 19627.0642226493. The cubic root of 385221650 is about 727.6182147108.

The spelling of 385221650 in words is "three hundred eighty-five million, two hundred twenty-one thousand, six hundred fifty".