861722498 has 32 divisors (see below), whose sum is σ = 1594204416. Its totient is φ = 340187328.

The previous prime is 861722479. The next prime is 861722507. The reversal of 861722498 is 894227168.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86840 + ... + 96252.

It is an arithmetic number, because the mean of its divisors is an integer number (49818888).

Almost surely, 2^861722498 is an apocalyptic number.

861722498 is a deficient number, since it is larger than the sum of its proper divisors (732481918).

861722498 is a wasteful number, since it uses less digits than its factorization.

861722498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9938.

The product of its digits is 387072, while the sum is 47.

The square root of 861722498 is about 29355.1102535828. The cubic root of 861722498 is about 951.6030176671.

The spelling of 861722498 in words is "eight hundred sixty-one million, seven hundred twenty-two thousand, four hundred ninety-eight".