81157702 has 8 divisors (see below), whose sum is σ = 128143800. Its totient is φ = 38443104.

The previous prime is 81157697. The next prime is 81157723. The reversal of 81157702 is 20775118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067827 + ... + 1067902.

It is an arithmetic number, because the mean of its divisors is an integer number (16017975).

Almost surely, 2^81157702 is an apocalyptic number.

81157702 is a deficient number, since it is larger than the sum of its proper divisors (46986098).

81157702 is a wasteful number, since it uses less digits than its factorization.

81157702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135750.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 81157702 is about 9008.7569619787. The cubic root of 81157702 is about 432.9554861461.

The spelling of 81157702 in words is "eighty-one million, one hundred fifty-seven thousand, seven hundred two".