1897628864 has 14 divisors (see below), whose sum is σ = 3765607404. Its totient is φ = 948814400.

The previous prime is 1897628861. The next prime is 1897628867. The reversal of 1897628864 is 4688267981.

It is an interprime number because it is at equal distance from previous prime (1897628861) and next prime (1897628867).

It is not an unprimeable number, because it can be changed into a prime (1897628861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14825162 + ... + 14825289.

Almost surely, 2^1897628864 is an apocalyptic number.

It is an amenable number.

1897628864 is a deficient number, since it is larger than the sum of its proper divisors (1867978540).

1897628864 is an equidigital number, since it uses as much as digits as its factorization.

1897628864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29650463 (or 29650453 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 59.

The square root of 1897628864 is about 43561.7821490352. The cubic root of 1897628864 is about 1238.0468871299.

The spelling of 1897628864 in words is "one billion, eight hundred ninety-seven million, six hundred twenty-eight thousand, eight hundred sixty-four".