64129420 has 12 divisors (see below), whose sum is σ = 134671824. Its totient is φ = 25651760.

The previous prime is 64129409. The next prime is 64129433. The reversal of 64129420 is 2492146.

It is a super-2 number, since 2×64129420² = 8225165019072800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603216 + ... + 1603255.

It is an arithmetic number, because the mean of its divisors is an integer number (11222652).

Almost surely, 2^64129420 is an apocalyptic number.

It is an amenable number.

64129420 is an abundant number, since it is smaller than the sum of its proper divisors (70542404).

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

64129420 is a wasteful number, since it uses less digits than its factorization.

64129420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206480 (or 3206478 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 64129420 is about 8008.0846648871. The cubic root of 64129420 is about 400.2694434598.

The spelling of 64129420 in words is "sixty-four million, one hundred twenty-nine thousand, four hundred twenty".