147664621 has 8 divisors (see below), whose sum is σ = 159147800. Its totient is φ = 136199232.

The previous prime is 147664613. The next prime is 147664631. The reversal of 147664621 is 126466741.

It can be written as a sum of positive squares in 4 ways, for example, as 8094025 + 139570596 = 2845^2 + 11814^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 147664621 - 2³ = 147664613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147664631) 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, 16471 + ... + 23803.

It is an arithmetic number, because the mean of its divisors is an integer number (19893475).

Almost surely, 2^147664621 is an apocalyptic number.

It is an amenable number.

147664621 is a deficient number, since it is larger than the sum of its proper divisors (11483179).

147664621 is a wasteful number, since it uses less digits than its factorization.

147664621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8895.

The product of its digits is 48384, while the sum is 37.

The square root of 147664621 is about 12151.7332508577. The cubic root of 147664621 is about 528.5573929384.

The spelling of 147664621 in words is "one hundred forty-seven million, six hundred sixty-four thousand, six hundred twenty-one".