64371620890 has 8 divisors (see below), whose sum is σ = 115868917620. Its totient is φ = 25748648352.

The previous prime is 64371620821. The next prime is 64371620897. The reversal of 64371620890 is 9802617346.

It can be written as a sum of positive squares in 2 ways, for example, as 58185641089 + 6185979801 = 241217^2 + 78651^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 64371620890.

It is not an unprimeable number, because it can be changed into a prime (64371620897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218581035 + ... + 3218581054.

Almost surely, 2^64371620890 is an apocalyptic number.

64371620890 is a deficient number, since it is larger than the sum of its proper divisors (51497296730).

64371620890 is a wasteful number, since it uses less digits than its factorization.

64371620890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437162096.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 64371620890 in words is "sixty-four billion, three hundred seventy-one million, six hundred twenty thousand, eight hundred ninety".