29890517078 has 4 divisors (see below), whose sum is σ = 44835775620. Its totient is φ = 14945258538.

The previous prime is 29890517057. The next prime is 29890517093. The reversal of 29890517078 is 87071509892.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×29890517078² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7472629268 + ... + 7472629271.

It is an arithmetic number, because the mean of its divisors is an integer number (11208943905).

Almost surely, 2^29890517078 is an apocalyptic number.

29890517078 is a deficient number, since it is larger than the sum of its proper divisors (14945258542).

29890517078 is a wasteful number, since it uses less digits than its factorization.

29890517078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14945258541.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 29890517078 in words is "twenty-nine billion, eight hundred ninety million, five hundred seventeen thousand, seventy-eight".