71903440 has 40 divisors (see below), whose sum is σ = 191059200. Its totient is φ = 24652416.

The previous prime is 71903413. The next prime is 71903443. The reversal of 71903440 is 4430917.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 71903399 and 71903408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71903443) 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, 63640 + ... + 64759.

It is an arithmetic number, because the mean of its divisors is an integer number (4776480).

Almost surely, 2^71903440 is an apocalyptic number.

71903440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71903440 is an abundant number, since it is smaller than the sum of its proper divisors (119155760).

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

71903440 is a wasteful number, since it uses less digits than its factorization.

71903440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128419 (or 128413 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71903440 is about 8479.5896127112. The cubic root of 71903440 is about 415.8307065089.

The spelling of 71903440 in words is "seventy-one million, nine hundred three thousand, four hundred forty".