23778534 has 32 divisors (see below), whose sum is σ = 52093440. Its totient is φ = 7191072.

The previous prime is 23778533. The next prime is 23778553. The reversal of 23778534 is 43587732.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 23778492 and 23778501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23778533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2019 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^23778534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23778534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26046720).

23778534 is an abundant number, since it is smaller than the sum of its proper divisors (28314906).

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

23778534 is a wasteful number, since it uses less digits than its factorization.

23778534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244.

The product of its digits is 141120, while the sum is 39.

The square root of 23778534 is about 4876.3238202564. The cubic root of 23778534 is about 287.5599229853.

The spelling of 23778534 in words is "twenty-three million, seven hundred seventy-eight thousand, five hundred thirty-four".