71129240 has 64 divisors (see below), whose sum is σ = 196983360. Its totient is φ = 22510080.

The previous prime is 71129231. The next prime is 71129243. The reversal of 71129240 is 4292117.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71129243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6131 + ... + 13410.

It is an arithmetic number, because the mean of its divisors is an integer number (3077865).

Almost surely, 2^71129240 is an apocalyptic number.

71129240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71129240 is an abundant number, since it is smaller than the sum of its proper divisors (125854120).

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

71129240 is a wasteful number, since it uses less digits than its factorization.

71129240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19572 (or 19568 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 71129240 is about 8433.8152694970. The cubic root of 71129240 is about 414.3328711396.

The spelling of 71129240 in words is "seventy-one million, one hundred twenty-nine thousand, two hundred forty".