75021690 has 32 divisors (see below), whose sum is σ = 189529920. Its totient is φ = 18952704.

The previous prime is 75021619. The next prime is 75021691. The reversal of 75021690 is 9612057.

It is a super-2 number, since 2×75021690² = 11256507940912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75021691) 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, 65239 + ... + 66378.

It is an arithmetic number, because the mean of its divisors is an integer number (5922810).

Almost surely, 2^75021690 is an apocalyptic number.

75021690 is an abundant number, since it is smaller than the sum of its proper divisors (114508230).

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

75021690 is a wasteful number, since it uses less digits than its factorization.

75021690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131646.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 75021690 is about 8661.5062200520. The cubic root of 75021690 is about 421.7569821870.

The spelling of 75021690 in words is "seventy-five million, twenty-one thousand, six hundred ninety".