28970190781 has 8 divisors (see below), whose sum is σ = 33878761664. Its totient is φ = 24254112960.

The previous prime is 28970190761. The next prime is 28970190811. The reversal of 28970190781 is 18709107982.

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

It is a de Polignac number, because none of the positive numbers 2^k-28970190781 is a prime.

It is a super-2 number, since 2×28970190781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28970190721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48122940 + ... + 48123541.

It is an arithmetic number, because the mean of its divisors is an integer number (4234845208).

Almost surely, 2^28970190781 is an apocalyptic number.

It is an amenable number.

28970190781 is a deficient number, since it is larger than the sum of its proper divisors (4908570883).

28970190781 is an equidigital number, since it uses as much as digits as its factorization.

28970190781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96246531.

The product of its (nonzero) digits is 508032, while the sum is 52.

The spelling of 28970190781 in words is "twenty-eight billion, nine hundred seventy million, one hundred ninety thousand, seven hundred eighty-one".