69917940 has 144 divisors (see below), whose sum is σ = 228363408. Its totient is φ = 17252352.

The previous prime is 69917933. The next prime is 69917951. The reversal of 69917940 is 4971996.

It can be written as a sum of positive squares in 8 ways, for example, as 4016016 + 65901924 = 2004^2 + 8118^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 223224 + ... + 223536.

It is an arithmetic number, because the mean of its divisors is an integer number (1585857).

Almost surely, 2^69917940 is an apocalyptic number.

69917940 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 69917940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114181704).

69917940 is an abundant number, since it is smaller than the sum of its proper divisors (158445468).

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

69917940 is a wasteful number, since it uses less digits than its factorization.

69917940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 413 counting only the distinct ones).

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

The square root of 69917940 is about 8361.6948042846. The cubic root of 69917940 is about 411.9674228805.

The spelling of 69917940 in words is "sixty-nine million, nine hundred seventeen thousand, nine hundred forty".