75721940 has 24 divisors (see below), whose sum is σ = 181732992. Its totient is φ = 25961760.

The previous prime is 75721907. The next prime is 75721963. The reversal of 75721940 is 4912757.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 75721940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270296 + ... + 270575.

It is an arithmetic number, because the mean of its divisors is an integer number (7572208).

Almost surely, 2^75721940 is an apocalyptic number.

75721940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

75721940 is an abundant number, since it is smaller than the sum of its proper divisors (106011052).

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

75721940 is a wasteful number, since it uses less digits than its factorization.

75721940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540887 (or 540885 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 75721940 is about 8701.8354385727. The cubic root of 75721940 is about 423.0651424395.

The spelling of 75721940 in words is "seventy-five million, seven hundred twenty-one thousand, nine hundred forty".