991996470 has 48 divisors (see below), whose sum is σ = 2674722960. Its totient is φ = 264531744.

The previous prime is 991996459. The next prime is 991996471. The reversal of 991996470 is 74699199.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991996471) 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, 201685 + ... + 206544.

It is an arithmetic number, because the mean of its divisors is an integer number (55723395).

Almost surely, 2^991996470 is an apocalyptic number.

991996470 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

991996470 is an abundant number, since it is smaller than the sum of its proper divisors (1682726490).

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

991996470 is a wasteful number, since it uses less digits than its factorization.

991996470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408251 (or 408239 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 991996470 is about 31495.9754571914. The cubic root of 991996470 is about 997.3250074620.

It can be divided in two parts, 99 and 1996470, that added together give a square (1996569 = 1413²).

The spelling of 991996470 in words is "nine hundred ninety-one million, nine hundred ninety-six thousand, four hundred seventy".