70691904 has 168 divisors, whose sum is σ = 216822528. Its totient is φ = 21980160.

The previous prime is 70691897. The next prime is 70691909. The reversal of 70691904 is 40919607.

It is a super-2 number, since 2×70691904² = 9994690582290432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (70691909) 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, 660619 + ... + 660725.

Almost surely, 2^70691904 is an apocalyptic number.

70691904 is a gapful number since it is divisible by the number (74) 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 70691904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108411264).

70691904 is an abundant number, since it is smaller than the sum of its proper divisors (146130624).

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

70691904 is a wasteful number, since it uses less digits than its factorization.

70691904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 70691904 is about 8407.8477626560. The cubic root of 70691904 is about 413.4819537233.

The spelling of 70691904 in words is "seventy million, six hundred ninety-one thousand, nine hundred four".