612221664 has 48 divisors (see below), whose sum is σ = 1609750800. Its totient is φ = 203735040.

The previous prime is 612221651. The next prime is 612221677. The reversal of 612221664 is 466122216.

It is an interprime number because it is at equal distance from previous prime (612221651) and next prime (612221677).

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56562 + ... + 66510.

It is an arithmetic number, because the mean of its divisors is an integer number (33536475).

Almost surely, 2^612221664 is an apocalyptic number.

It is an amenable number.

612221664 is an abundant number, since it is smaller than the sum of its proper divisors (997529136).

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

612221664 is a wasteful number, since it uses less digits than its factorization.

612221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10603 (or 10595 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 612221664 is about 24743.1134661748. The cubic root of 612221664 is about 849.1209662253.

The spelling of 612221664 in words is "six hundred twelve million, two hundred twenty-one thousand, six hundred sixty-four".