81152650 has 12 divisors (see below), whose sum is σ = 150944022. Its totient is φ = 32461040.

The previous prime is 81152641. The next prime is 81152657. The reversal of 81152650 is 5625118.

It can be written as a sum of positive squares in 3 ways, for example, as 43046721 + 38105929 = 6561^2 + 6173^2 .

It is not an unprimeable number, because it can be changed into a prime (81152657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 811477 + ... + 811576.

Almost surely, 2^81152650 is an apocalyptic number.

81152650 is a deficient number, since it is larger than the sum of its proper divisors (69791372).

81152650 is a wasteful number, since it uses less digits than its factorization.

81152650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623065 (or 1623060 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 81152650 is about 9008.4765637704. The cubic root of 81152650 is about 432.9465022524.

Adding to 81152650 its reverse (5625118), we get a palindrome (86777768).

The spelling of 81152650 in words is "eighty-one million, one hundred fifty-two thousand, six hundred fifty".