75631990 has 24 divisors (see below), whose sum is σ = 158365152. Its totient is φ = 25930800.

The previous prime is 75631949. The next prime is 75631999. The reversal of 75631990 is 9913657.

It is a super-2 number, since 2×75631990² = 11440395822720200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75631999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76686 + ... + 77665.

It is an arithmetic number, because the mean of its divisors is an integer number (6598548).

Almost surely, 2^75631990 is an apocalyptic number.

75631990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

75631990 is an abundant number, since it is smaller than the sum of its proper divisors (82733162).

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

75631990 is a wasteful number, since it uses less digits than its factorization.

75631990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154372 (or 154365 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 75631990 is about 8696.6654529193. The cubic root of 75631990 is about 422.8975565417.

The spelling of 75631990 in words is "seventy-five million, six hundred thirty-one thousand, nine hundred ninety".