47172978 has 48 divisors (see below), whose sum is σ = 106460640. Its totient is φ = 15083712.

The previous prime is 47172973. The next prime is 47172997. The reversal of 47172978 is 87927174.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (47172973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45150 + ... + 46182.

It is an arithmetic number, because the mean of its divisors is an integer number (2217930).

Almost surely, 2^47172978 is an apocalyptic number.

47172978 is an abundant number, since it is smaller than the sum of its proper divisors (59287662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47172978 is a wasteful number, since it uses less digits than its factorization.

47172978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1140 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 47172978 is about 6868.2587312943. The cubic root of 47172978 is about 361.3247947205.

The spelling of 47172978 in words is "forty-seven million, one hundred seventy-two thousand, nine hundred seventy-eight".