390641280 has 64 divisors (see below), whose sum is σ = 1245175200. Its totient is φ = 104170496.

The previous prime is 390641267. The next prime is 390641287. The reversal of 390641280 is 82146093.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (390641287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99810 + ... + 103649.

Almost surely, 2^390641280 is an apocalyptic number.

390641280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390641280 is an abundant number, since it is smaller than the sum of its proper divisors (854533920).

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

390641280 is a wasteful number, since it uses less digits than its factorization.

390641280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203481 (or 203469 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 390641280 is about 19764.6472268037. The cubic root of 390641280 is about 731.0145897207.

The spelling of 390641280 in words is "three hundred ninety million, six hundred forty-one thousand, two hundred eighty".