64421736 has 32 divisors (see below), whose sum is σ = 165409440. Its totient is φ = 20893248.

The previous prime is 64421729. The next prime is 64421743. The reversal of 64421736 is 63712446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64421729) and next prime (64421743).

It is a junction number, because it is equal to n+sod(n) for n = 64421697 and 64421706.

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, 35386 + ... + 37161.

It is an arithmetic number, because the mean of its divisors is an integer number (5169045).

Almost surely, 2^64421736 is an apocalyptic number.

It is an amenable number.

64421736 is an abundant number, since it is smaller than the sum of its proper divisors (100987704).

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

64421736 is a wasteful number, since it uses less digits than its factorization.

64421736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72593 (or 72589 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 64421736 is about 8026.3152193270. The cubic root of 64421736 is about 400.8766937829.

The spelling of 64421736 in words is "sixty-four million, four hundred twenty-one thousand, seven hundred thirty-six".