64499449770 has 64 divisors (see below), whose sum is σ = 196569757440. Its totient is φ = 14742730944.

The previous prime is 64499449759. The next prime is 64499449771. The reversal of 64499449770 is 7794499446.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 64499449698 and 64499449707.

It is not an unprimeable number, because it can be changed into a prime (64499449771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17061457 + ... + 17065236.

It is an arithmetic number, because the mean of its divisors is an integer number (3071402460).

Almost surely, 2^64499449770 is an apocalyptic number.

64499449770 is an abundant number, since it is smaller than the sum of its proper divisors (132070307670).

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

64499449770 is a wasteful number, since it uses less digits than its factorization.

64499449770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34126716 (or 34126710 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 63.

The spelling of 64499449770 in words is "sixty-four billion, four hundred ninety-nine million, four hundred forty-nine thousand, seven hundred seventy".