23649990 has 64 divisors (see below), whose sum is σ = 69866496. Its totient is φ = 4989312.

The previous prime is 23649959. The next prime is 23649991. The reversal of 23649990 is 9994632.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23649991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1602 + ... + 7061.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^23649990 is an apocalyptic number.

23649990 is an abundant number, since it is smaller than the sum of its proper divisors (46216506).

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

23649990 is a wasteful number, since it uses less digits than its factorization.

23649990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 23649990 is about 4863.1255381699. The cubic root of 23649990 is about 287.0408145688.

The spelling of 23649990 in words is "twenty-three million, six hundred forty-nine thousand, nine hundred ninety".