1025780217 has 64 divisors (see below), whose sum is σ = 1759739904. Its totient is φ = 516075840.

The previous prime is 1025780191. The next prime is 1025780237. The reversal of 1025780217 is 7120875201.

It is not a de Polignac number, because 1025780217 - 2¹⁰ = 1025779193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1025780237) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1161258 + ... + 1162140.

It is an arithmetic number, because the mean of its divisors is an integer number (27495936).

Almost surely, 2^1025780217 is an apocalyptic number.

It is an amenable number.

1025780217 is a deficient number, since it is larger than the sum of its proper divisors (733959687).

1025780217 is a wasteful number, since it uses less digits than its factorization.

1025780217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 1025780217 is about 32027.8038116884. The cubic root of 1025780217 is about 1008.5205988615.

The spelling of 1025780217 in words is "one billion, twenty-five million, seven hundred eighty thousand, two hundred seventeen".