1964324640 has 48 divisors (see below), whose sum is σ = 6187624128. Its totient is φ = 523819776.

The previous prime is 1964324617. The next prime is 1964324689. The reversal of 1964324640 is 464234691.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1964324640² = 7717142582622259200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2045692 + ... + 2046651.

It is an arithmetic number, because the mean of its divisors is an integer number (128908836).

Almost surely, 2^1964324640 is an apocalyptic number.

1964324640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1964324640 is an abundant number, since it is smaller than the sum of its proper divisors (4223299488).

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

1964324640 is a wasteful number, since it uses less digits than its factorization.

1964324640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092361 (or 4092353 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 1964324640 is about 44320.7021605028. The cubic root of 1964324640 is about 1252.3847041890.

The spelling of 1964324640 in words is "one billion, nine hundred sixty-four million, three hundred twenty-four thousand, six hundred forty".