69979140 has 432 divisors, whose sum is σ = 292795776. Its totient is φ = 13685760.

The previous prime is 69979111. The next prime is 69979141. The reversal of 69979140 is 4197996.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69979141) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4116412 + ... + 4116428.

It is an arithmetic number, because the mean of its divisors is an integer number (677768).

Almost surely, 2^69979140 is an apocalyptic number.

69979140 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 69979140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146397888).

69979140 is an abundant number, since it is smaller than the sum of its proper divisors (222816636).

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

69979140 is a wasteful number, since it uses less digits than its factorization.

69979140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 69979140 is about 8365.3535490139. The cubic root of 69979140 is about 412.0875878130.

The spelling of 69979140 in words is "sixty-nine million, nine hundred seventy-nine thousand, one hundred forty".