81970762 has 16 divisors (see below), whose sum is σ = 130637160. Its totient is φ = 38501568.

The previous prime is 81970739. The next prime is 81970783. The reversal of 81970762 is 26707918.

It can be written as a sum of positive squares in 4 ways, for example, as 77598481 + 4372281 = 8809^2 + 2091^2 .

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, 16953 + ... + 21244.

Almost surely, 2^81970762 is an apocalyptic number.

81970762 is a deficient number, since it is larger than the sum of its proper divisors (48666398).

81970762 is a wasteful number, since it uses less digits than its factorization.

81970762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38265.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 81970762 is about 9053.7705957242. The cubic root of 81970762 is about 434.3965066866.

The spelling of 81970762 in words is "eighty-one million, nine hundred seventy thousand, seven hundred sixty-two".