6197721390 has 144 divisors (see below), whose sum is σ = 19053066240. Its totient is φ = 1393338240.

The previous prime is 6197721379. The next prime is 6197721401. The reversal of 6197721390 is 931277916.

6197721390 is a `hidden beast` number, since 6 + 197 + 72 + 1 + 390 = 666.

It is an interprime number because it is at equal distance from previous prime (6197721379) and next prime (6197721401).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 257491 + ... + 280529.

It is an arithmetic number, because the mean of its divisors is an integer number (132312960).

Almost surely, 2^6197721390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6197721390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9526533120).

6197721390 is an abundant number, since it is smaller than the sum of its proper divisors (12855344850).

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

6197721390 is a wasteful number, since it uses less digits than its factorization.

6197721390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23127 (or 23117 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 6197721390 is about 78725.6082224837. The cubic root of 6197721390 is about 1836.8654679812.

The spelling of 6197721390 in words is "six billion, one hundred ninety-seven million, seven hundred twenty-one thousand, three hundred ninety".