70561920 has 256 divisors, whose sum is σ = 265265280. Its totient is φ = 15728640.

The previous prime is 70561903. The next prime is 70561927. The reversal of 70561920 is 2916507.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70561927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274432 + ... + 274688.

Almost surely, 2^70561920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70561920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132632640).

70561920 is an abundant number, since it is smaller than the sum of its proper divisors (194703360).

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

70561920 is a wasteful number, since it uses less digits than its factorization.

70561920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 70561920 is about 8400.1142849368. The cubic root of 70561920 is about 413.2283696937.

The spelling of 70561920 in words is "seventy million, five hundred sixty-one thousand, nine hundred twenty".