97878947 has 4 divisors (see below), whose sum is σ = 97935096. Its totient is φ = 97822800.

The previous prime is 97878941. The next prime is 97878971. The reversal of 97878947 is 74987879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74987879 = 59 ⋅1270981.

It is a cyclic number.

It is not a de Polignac number, because 97878947 - 2⁶ = 97878883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97878941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25373 + ... + 28974.

It is an arithmetic number, because the mean of its divisors is an integer number (24483774).

Almost surely, 2^97878947 is an apocalyptic number.

97878947 is a deficient number, since it is larger than the sum of its proper divisors (56149).

97878947 is a wasteful number, since it uses less digits than its factorization.

97878947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56148.

The product of its digits is 7112448, while the sum is 59.

The square root of 97878947 is about 9893.3789475588. The cubic root of 97878947 is about 460.8537186276.

The spelling of 97878947 in words is "ninety-seven million, eight hundred seventy-eight thousand, nine hundred forty-seven".