69989940 has 192 divisors, whose sum is σ = 232888320. Its totient is φ = 17418240.

The previous prime is 69989923. The next prime is 69990029. The reversal of 69989940 is 4998996.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 619324 + ... + 619436.

It is an arithmetic number, because the mean of its divisors is an integer number (1212960).

Almost surely, 2^69989940 is an apocalyptic number.

69989940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69989940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116444160).

69989940 is an abundant number, since it is smaller than the sum of its proper divisors (162898380).

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

69989940 is a wasteful number, since it uses less digits than its factorization.

69989940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 69989940 is about 8365.9990437485. Note that the first 3 decimals coincide. The cubic root of 69989940 is about 412.1087861159.

The spelling of 69989940 in words is "sixty-nine million, nine hundred eighty-nine thousand, nine hundred forty".