1625686464 has 56 divisors (see below), whose sum is σ = 4417565968. Its totient is φ = 527247360.

The previous prime is 1625686463. The next prime is 1625686471. The reversal of 1625686464 is 4646865261.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625686463) 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, 107317 + ... + 121524.

Almost surely, 2^1625686464 is an apocalyptic number.

It is an amenable number.

1625686464 is an abundant number, since it is smaller than the sum of its proper divisors (2791879504).

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

1625686464 is a wasteful number, since it uses less digits than its factorization.

1625686464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228893 (or 228883 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 1625686464 is about 40319.8023804681. The cubic root of 1625686464 is about 1175.8328699507.

The spelling of 1625686464 in words is "one billion, six hundred twenty-five million, six hundred eighty-six thousand, four hundred sixty-four".