23719640 has 32 divisors (see below), whose sum is σ = 60994080. Its totient is φ = 8132352.

The previous prime is 23719639. The next prime is 23719643. The reversal of 23719640 is 4691732.

It is a junction number, because it is equal to n+sod(n) for n = 23719597 and 23719606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23719643) 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, 42077 + ... + 42636.

It is an arithmetic number, because the mean of its divisors is an integer number (1906065).

Almost surely, 2^23719640 is an apocalyptic number.

23719640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23719640 is an abundant number, since it is smaller than the sum of its proper divisors (37274440).

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

23719640 is a wasteful number, since it uses less digits than its factorization.

23719640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84731 (or 84727 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 23719640 is about 4870.2813060438. The cubic root of 23719640 is about 287.3223199549.

The spelling of 23719640 in words is "twenty-three million, seven hundred nineteen thousand, six hundred forty".