71999998 has 32 divisors (see below), whose sum is σ = 131212224. Its totient is φ = 28925952.

The previous prime is 71999989. The next prime is 71999999. The reversal of 71999998 is 89999917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71999999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83586 + ... + 84442.

It is an arithmetic number, because the mean of its divisors is an integer number (4100382).

Almost surely, 2^71999998 is an apocalyptic number.

71999998 is a deficient number, since it is larger than the sum of its proper divisors (59212226).

71999998 is a wasteful number, since it uses less digits than its factorization.

71999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236.

The product of its digits is 3306744, while the sum is 61.

The square root of 71999998 is about 8485.2812563874. The cubic root of 71999998 is about 416.0167607584.

It can be divided in two parts, 7 and 1999998, that multiplied together give a triangular number (13999986 = T₅₂₉₁).

The spelling of 71999998 in words is "seventy-one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".