64990464 has 216 divisors, whose sum is σ = 220899168. Its totient is φ = 16773120.

The previous prime is 64990459. The next prime is 64990483. The reversal of 64990464 is 46409946.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 413874 + ... + 414030.

Almost surely, 2^64990464 is an apocalyptic number.

64990464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64990464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110449584).

64990464 is an abundant number, since it is smaller than the sum of its proper divisors (155908704).

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

64990464 is a wasteful number, since it uses less digits than its factorization.

64990464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 64990464 is about 8061.6663289918. Note that the first 3 decimals coincide. The cubic root of 64990464 is about 402.0529125174.

It can be divided in two parts, 64 and 990464, that added together give a triangular number (990528 = T₁₄₀₇).

The spelling of 64990464 in words is "sixty-four million, nine hundred ninety thousand, four hundred sixty-four".