136439864 has 32 divisors (see below), whose sum is σ = 291219840. Its totient is φ = 59320800.

The previous prime is 136439857. The next prime is 136439869. The reversal of 136439864 is 468934631.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136439869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31682 + ... + 35729.

It is an arithmetic number, because the mean of its divisors is an integer number (9100620).

Almost surely, 2^136439864 is an apocalyptic number.

It is an amenable number.

136439864 is an abundant number, since it is smaller than the sum of its proper divisors (154779976).

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

136439864 is a wasteful number, since it uses less digits than its factorization.

136439864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67451 (or 67447 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The square root of 136439864 is about 11680.7475788153. The cubic root of 136439864 is about 514.8101402138.

The spelling of 136439864 in words is "one hundred thirty-six million, four hundred thirty-nine thousand, eight hundred sixty-four".