623542749 has 8 divisors (see below), whose sum is σ = 849079680. Its totient is φ = 406850496.

The previous prime is 623542747. The next prime is 623542771. The reversal of 623542749 is 947245326.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 623542749 - 2¹ = 623542747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 623542749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623542747) 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, 2211004 + ... + 2211285.

It is an arithmetic number, because the mean of its divisors is an integer number (106134960).

Almost surely, 2^623542749 is an apocalyptic number.

It is an amenable number.

623542749 is a deficient number, since it is larger than the sum of its proper divisors (225536931).

623542749 is a wasteful number, since it uses less digits than its factorization.

623542749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422339.

The product of its digits is 362880, while the sum is 42.

The square root of 623542749 is about 24970.8379715219. The cubic root of 623542749 is about 854.3229591120.

It can be divided in two parts, 6235 and 42749, that added together give a palindrome (48984).

The spelling of 623542749 in words is "six hundred twenty-three million, five hundred forty-two thousand, seven hundred forty-nine".