1621247064 has 24 divisors (see below), whose sum is σ = 4053610860. Its totient is φ = 540349936.

The previous prime is 1621247057. The next prime is 1621247071. The reversal of 1621247064 is 4607421261.

It is an interprime number because it is at equal distance from previous prime (1621247057) and next prime (1621247071).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193147 + ... + 201365.

Almost surely, 2^1621247064 is an apocalyptic number.

It is an amenable number.

1621247064 is an abundant number, since it is smaller than the sum of its proper divisors (2432363796).

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

1621247064 is an frugal number, since it uses more digits than its factorization.

1621247064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16447 (or 8224 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 1621247064 is about 40264.7123918699. The cubic root of 1621247064 is about 1174.7615786657.

The spelling of 1621247064 in words is "one billion, six hundred twenty-one million, two hundred forty-seven thousand, sixty-four".