70491820 has 48 divisors (see below), whose sum is σ = 169985088. Its totient is φ = 24053760.

The previous prime is 70491787. The next prime is 70491823. The reversal of 70491820 is 2819407.

It is not an unprimeable number, because it can be changed into a prime (70491823) 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, 31540 + ... + 33700.

It is an arithmetic number, because the mean of its divisors is an integer number (3541356).

Almost surely, 2^70491820 is an apocalyptic number.

70491820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70491820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84992544).

70491820 is an abundant number, since it is smaller than the sum of its proper divisors (99493268).

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

70491820 is a wasteful number, since it uses less digits than its factorization.

70491820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410 (or 2408 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 70491820 is about 8395.9406858315. The cubic root of 70491820 is about 413.0914832703.

The spelling of 70491820 in words is "seventy million, four hundred ninety-one thousand, eight hundred twenty".