64626242440 has 32 divisors (see below), whose sum is σ = 145428644160. Its totient is φ = 25847012800.

The previous prime is 64626242383. The next prime is 64626242449. The reversal of 64626242440 is 4424262646.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64626242393 and 64626242402.

It is not an unprimeable number, because it can be changed into a prime (64626242449) 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, 202605 + ... + 412675.

It is an arithmetic number, because the mean of its divisors is an integer number (4544645130).

Almost surely, 2^64626242440 is an apocalyptic number.

It is an amenable number.

64626242440 is an abundant number, since it is smaller than the sum of its proper divisors (80802401720).

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

64626242440 is a wasteful number, since it uses less digits than its factorization.

64626242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217773 (or 217769 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 40.

The spelling of 64626242440 in words is "sixty-four billion, six hundred twenty-six million, two hundred forty-two thousand, four hundred forty".