75040020 has 120 divisors (see below), whose sum is σ = 256864608. Its totient is φ = 18187200.

The previous prime is 75040013. The next prime is 75040027. The reversal of 75040020 is 2004057.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (75040013) and next prime (75040027).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 75039975 and 75040002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75040027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15715 + ... + 19925.

Almost surely, 2^75040020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 75040020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128432304).

75040020 is an abundant number, since it is smaller than the sum of its proper divisors (181824588).

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

75040020 is a wasteful number, since it uses less digits than its factorization.

75040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 75040020 is about 8662.5642854758. The cubic root of 75040020 is about 421.7913285915.

Adding to 75040020 its reverse (2004057), we get a palindrome (77044077).

The spelling of 75040020 in words is "seventy-five million, forty thousand, twenty".